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Tom Gurney BSc (Hons) is an art history expert with over 20 years experience
Published on June 19, 2020 / Updated on September 27, 2026
Email: tomgurney1@gmail.com / Phone: +44 7429 011000

Explore Klee’s works

“Paintings” is a useful doorway into Paul Klee's art, but it is an imperfect name for the whole room. The Zentrum Paul Klee estimates that roughly 80 per cent of his oeuvre consists of works on paper. Its own collection has a similar proportion of drawings and watercolours, alongside a smaller group it calls paintings. A visitor who expects mainly oil on canvas will miss the watercolour, gouache, oil-transfer drawing, paste colour, mounted paper, gauze, jute and artist-made borders that help make Klee's pictures distinctive. This guide uses the familiar site label while pointing to the actual material of individual works.[1][2]

Klee was born in 1879 and died in 1940. Over those decades he made about 9,600 works, in the Zentrum Paul Klee's current accounting. A number of them have more than one worked face, were cut or remounted, or passed through different titles and descriptions. That makes a one-line list of “paintings” a way to browse, not an authority on exactly what was made, how it was made or which side Klee regarded as final. The best entry point is an identified work with a collection record, a date, its materials and a source for the interpretation that follows.[2][3]

Contents

  1. What counts as a Klee painting?
  2. How did his pictures change across his career?
  3. Why do support and reverse side matter?
  4. Where do work numbers and titles come from?
  5. How should I browse the works here?
  6. Artworks directory
  7. What can a catalogue tell us, and what can it not?

What counts as a Klee painting?

A museum's category can describe a department, a dominant technique or a practical way to catalogue a work. It is not always a literal account of every layer. MoMA, for example, files Twittering Machine under Drawings and Prints and describes it as oil-transfer drawing, watercolour and ink on paper, with gouache and ink borders on board. Its image has colour and a made frame, yet it is neither an editioned print nor an oil-on-canvas painting. The Philadelphia Museum of Art describes Fish Magic as a black layer over earlier colours, scratched to bring those colours forward, with a square of muslin glued to the canvas. One word such as “painting” cannot show all of that physical construction.[4][5]

Klee sometimes made a coloured field and drew into it; elsewhere line, wash, ground and mount remained visibly separate. Paper could be an active surface rather than a disposable sketch support. The edges of a sheet and its artist-made mount can affect the image's scale, balance and title inscription. A catalogue medium line may list every known component, while a short guide calls the same object a drawing or painting. Rather than correct one institution by imposing a new universal label, ask what each description is trying to record and inspect the work-specific evidence.[1][6]

The links on this page therefore include works that different collections place under paintings, drawings and prints. Readers interested specifically in line, transparent colour, editioned graphic work or physical technique can move to the dedicated drawings, watercolours, prints and materials and techniques pages. Those categories overlap in Klee's objects, but each asks a different question.[1][4]

How did his pictures change across his career?

Early Klee often worked through drawing, satire, dark oil experiments and experiments on glass before he became confident with brilliant colour. The 1914 Tunisia journey with August Macke and Louis Moilliet gave him a new encounter with light, architecture and translucent planes. It did not invent his interest in colour overnight. Works made during the journey, and works later developed from its memory, need to be distinguished. Hammamet with Its Mosque is a specific Met sheet whose architecture and later handling have been studied; In the Style of Kairouan exists in more than one distinct 1914 version, so title alone cannot identify the sheet. The Tunisia page treats the trip and its sources in more depth.[6][7]

From 1921 to 1931, Klee taught at the Bauhaus in Weimar and Dessau. His classes developed analyses of line, movement, tonal value and colour, but a finished work is not automatically an illustration of a particular lesson. Crystal Gradation, made in 1921, sets stepped geometry and watercolour in relation; Ancient Harmony, 1925, arranges coloured parts on a constructed support; Red Balloon, 1922, holds a city and a single hovering form in a finely balanced field. The works share concerns that he could discuss with students, but their dates, materials and pictorial choices differ. A specific formal resemblance is a starting question, not proof that the artist followed a classroom recipe.[8][9][10]

His image-making could be funny, uneasy and ambiguous at the same time. Twittering Machine joins birds, a crank and a precarious perch; its transfer line and added colour make the mechanism look both drawn and atmospheric. Cat and Bird reduces an encounter to a few charged forms, but the bird's place in the cat's head is an interpretation to test against the original. Senecio uses a mask-like face, a chalk ground and gauze; its Basel record supplies the physical object, while the association between the title and the groundsel plant is a separate linguistic and botanical matter. These are three different ways to build tension. Calling all three simply “childlike” or “abstract” would hide their method and subject.[4][11][12]

In the later 1920s and early 1930s, Klee used stripes, gridded colour, repeated marks and textured grounds in very different combinations. Highway and Byways connects path imagery to the stripe picture and his Egypt context; Ad Parnassum builds a large image from many small coloured marks; Fire in the Evening asks how bands of colour can hold a scene without giving the viewer a conventional perspective. Their formal kinship should not erase their distinct numbers, materials or titles. The dedicated pages let each work bear the evidential weight of the claims made about it.[13][14][15]

After Klee lost his Düsseldorf post in 1933 and returned to Bern, his art did not switch to a single “dark late style.” Some late images use broad black signs; others remain intensely coloured or formally delicate. Death and Fire, Struck from the List and Fire at Full Moon differ in support, inscription, context and degree to which a political or personal reading can be documented. A diagnosis or historical event cannot be assigned as the cause of every mark merely because it occurred in the artist's life. The late work page addresses the chronology and interpretive limits.[16][17]

Why do support and reverse side matter?

A picture is not just the face reproduced in a web thumbnail. The Zentrum Paul Klee's 2026 research identifies works on the reverse of about 600 of the roughly 9,600 works in its accounting. It describes some two-sided pictures as part of a continuing process. A reverse can be hidden by a mount or overpaint and found only through conservation. In other instances, thin paper lets a faint image show through. These are different physical situations, and a “verso” is not automatically a rejected draft.[2][3]

The museum's account of Glass Façade (1940) is a useful caution. Restoration revealed an image on the reverse that had long been covered by an overpaint. Other double-sided works were not entered by Klee in his own catalogue, and later decisions about their front or title could involve his son Felix. This is why dates, names and what a reproduction shows must be checked against object records, inscriptions and conservation findings. The press kit's images are supplied for exhibition reporting; they have not been copied into this page.[3]

Colour also depends on support. A ground may be black, chalky, absorbent or textured. A watercolour can sit transparently over earlier washes, while paste paint or gouache can obscure them. A rough weave can remain visible through the painted layer. Klee cut, mounted, bordered and sometimes worked the reverse of paper and cloth. The physical object may therefore challenge a simple division between finished painting, drawing and study. For Crystal Gradation, the current Basel material line identifies watercolour on paper with brush-and-pen border on cardboard. The reproduced work below is a comparison image, not a claim that all Bauhaus-era pictures were made by the same method.[1][8]

Paul Klee, Crystal Gradation, a stepped watercolour construction on mounted paper.
Paul Klee, Crystal Gradation (Kristall-Stufung), 1921,88. Kunstmuseum Basel, inv. 1968.407. Reproduction from the item-checked Rawpixel CC0 300 dpi master; displayed at 1024 px. The Basel object record supplies the work identity and material description. See the dedicated work page for its collection history and competing historical captions.[8][18]

Where do work numbers and titles come from?

Klee maintained a handwritten work register. A notation such as 1922,151 identifies a work within one year's sequence in that artist-made system. A later scholarly Catalogue raisonné Paul Klee was issued in nine volumes; its continuous entry number is a different identifier. For Twittering Machine, MoMA's provenance cites catalogue raisonné 2975, while specialist evidence identifies Klee's annual 1922,151. MoMA's 564.1939 is its own accession number. These three numbers serve three different functions; none should silently replace the others.[2][4][19]

The annual number is not a reliable day-by-day production order. In a study based on Klee's register and its copies, Christian Rümelin shows that Klee sometimes entered works retrospectively, changed titles, and grouped paintings, coloured sheets and drawings rather than listing every stage in the order it was made. He notes Klee's own doubt over whether one work registered as 1921,182 might have been made in 1920. A year and number are vital identity evidence, but neither alone dates each layer of a revised picture or proves that a higher-numbered drawing followed the painting it helped generate.[21]

The institution holding a work may use a German title, an English translation and a shorter public label. Spelling and punctuation can vary between Klee's inscription, a contemporary catalogue and a current display. Sometimes a title was supplied or expanded after his death. A familiar English name is valuable for finding a page, but it should be joined to the original title, year and number before two similar works are assumed to be one. In the Style of Kairouan is a concrete example: the Bern and LACMA versions have the same broad title but different 1914 work numbers and dimensions.[7]

The printed catalogue itself continues to acquire documented additions and corrections. In a 2022 article, catalogue researchers Osamu Okuda and Walther Fuchs present Burg 2, 1923,107, as a work rediscovered in 2017 and publish its photograph with the related Burg 1, 1923,106. They link the first to catalogue entry 3201 and add its materials, inscription, exhibitions and ownership history. This is a good example of what later object research can supply to an older entry; it is not evidence that every unverified name in a web list is a newly discovered Klee.[22]

The Zentrum Paul Klee says its collection database continues the nine-volume catalogue and is available on site by appointment. This site's alphabetical directory is a separate browsing tool. Its legacy names and routes are being checked against artist numbers and collection records; the directory is not a substitute for the archive or the printed catalogue. An unlinked name in it should not be taken as a verified object record, and a link may lead to a short older page pending revision.[2][20]

How should I browse the works here?

Start with a question. For transparent colour and built space, compare Hammamet with Its Mosque, Crystal Gradation and Ancient Harmony. For drawn line entering a coloured field, try Twittering Machine, Cat and Bird and Fish Magic. For a title that makes a picture's identity unusually important, read In the Style of Kairouan or Ad marginem. For late signs and historical pressure, compare Death and Fire with Struck from the List. These are routes into distinct object histories, not statements that one work caused another.[4][5][7][8][11][16]

The selected works below lead to the site's object pages. The older alphabetical lists remain available at A–G, H–S and T–Z. They are useful for finding legacy names, but title and route verification is still underway. When a work has a dedicated researched page, its own references and owner record should govern its date, medium and interpretation.[20]

Explore selected works from Klee’s much larger oeuvre. Titles without a link have an authenticated catalogue identity but no reviewed article yet.

Artworks directory

217 artworks

NameDateMedium
A Gate1939Painting and mixed media
A Woman for Gods1938Watercolour and mixed media
Ab Ovo1917Watercolour and mixed media
Above Mountain Summit1917Drawing and mixed media
Abstract Trio1923Drawing and mixed media
Acrobats1915Watercolour and mixed media
Actor's Mask1924Painting and mixed media
Ad Marginem1930Drawing and mixed media
Ad Parnassum1932Painting and mixed media
Adventurer Ship1927Drawing and mixed media
Affected Place1922Drawing and mixed media
After a Sketch from Zurich1914Watercolour and mixed media
After Drawing1919Print
After The Floods1936Watercolour and mixed media
All Souls' Picture1921Print
Ancient Harmony1925Painting and mixed media
Angel Applicant1939Drawing and mixed media
Angel Serves the Desired1920Print
Angel, Still Female1939Painting and mixed media
Angelus Novus1920Drawing and mixed media
Animal Terror1926Painting and mixed media
Arab Song1932Painting and mixed media
Archangel1938Painting and mixed media
Architecture1923Painting and mixed media
Architecture of the Plain1923Drawing and mixed media
Around the Fish1926Painting and mixed media
Arrival of the Air Steamer1921Drawing and mixed media
Asiatic God1924Painting and mixed media
Astrological Fantasy Portrait1924Drawing and mixed media
Athlete's Head1932Watercolour and mixed media
Aufgehender Stern1931Painting and mixed media
Autumn Flower1922Painting and mixed media
Bad Band1920Drawing and mixed media
Baroque Centaur1939Painting and mixed media
Before the Blitz1923Drawing and mixed media
Before the Snow1929Drawing and mixed media
Besessenes Madchen1924Watercolour and mixed media
Bird Garden1924Print
Bird Wandering Off1926Watercolour and mixed media
Blossoms in the Night1930Watercolour and mixed media
Blue-Bird-Pumpkin1939Painting and mixed media
Boats in the Flood1937Painting and mixed media
Botanical Theatre1934Drawing and mixed media
Boy in Fancy Dress1931Watercolour and mixed media
Broken Key1938Print
Brother and Sister1930Watercolour and mixed media
But the Red Roof1935Painting and mixed media
C - C = Fisch1931Watercolour and mixed media
Cacti1912Painting and mixed media
Camel (in Rhythmic Landscape with Trees)1920Drawing and mixed media
Captive Pierrot1923Drawing and mixed media
Castle and Sun1928Drawing and mixed media
Cat and Bird1928Drawing and mixed media
Cathedrals1925Watercolour and mixed media
Chalice of the Heart1937Painting and mixed media
Characters in Yellow1937Painting and mixed media
Chosen Site1927Mixed media
Christmas Picture1923Drawing and mixed media
City of Towers1916Painting and mixed media
Clarification1932Painting and mixed media
Collection of Figurines1926Painting and mixed media
Colorful Architecture1917Painting and mixed media
Comedians' Handbill1938Print
Comic Opera Singer1927Painting and mixed media
Composition1939Painting and mixed media
Composition with Figures1915Drawing and mixed media
Composition with the Yellow Half-Moon and the Y1918Watercolour and mixed media
Conch–Still Life II1939Watercolour and mixed media
Cosmic Composition1919Painting and mixed media
Crystal Gradation1921Drawing and mixed media
Dance of the Grieving Child1922Painting and mixed media
Dancing Girl1940Painting and mixed media
Das Licht und Etliches1931Mixed media
Death and Fire1940Painting and mixed media
Death for the Idea1915Print
Demon as Pirate1926Watercolour and mixed media
Diana1931Painting and mixed media
Diavolo Player1923Drawing and mixed media
Die Kapelle1917Watercolour and mixed media
Die Vase1938Painting and mixed media
Doctor1930Drawing and mixed media
Dredger and Sailboat1931Watercolour and mixed media
Ein Tor1939Painting and mixed media
Ein Weib fur Gotter1938Mixed media
Embrace1939Watercolour and mixed media
Episode before an Arab Town1923Print
Equals Infinity1932Painting and mixed media
Eros1923Drawing and mixed media
Error on Green1930Watercolour and mixed media
Evening Figure1935Drawing and mixed media
Falling Bird1919Print
Fermata1932Watercolour and mixed media
Fire Clown1921Watercolour and mixed media
Fire Full Moon1933Watercolour and mixed media
Fire in the Evening1929Painting and mixed media
Fish in the Harbour1916Watercolour and mixed media
Fish Magic1925Watercolour and mixed media
Flock of Birds1917Drawing and mixed media
Flora on Sand1927Watercolour and mixed media
Flower Myth1918Print
Flower Stand with Watering Can and Bucket1910Watercolour and mixed media
Flowering Tree (Abstraction with Reference to a Flowering Tree)1925Painting and mixed media
Flowers in Pots1923Print
Flowers in Stone1939Painting and mixed media
Forest Witch1938Painting and mixed media
Fright of a Girl1922Drawing and mixed media
Fruits on Red1930Drawing and mixed media
Full Moon1919Mixed media
Föhn Wind in Franz Marc's Garden1915Watercolour and mixed media
Garden in St Germain, The European Quarter near Tunis1914Watercolour and mixed media
Ghost Chamber with the Tall Door (New Version)1925Print
Ghost of a Genius1922Drawing and mixed media
Girl in Mourning1939Painting and mixed media
Glance of a Landscape1926Watercolour and mixed media
Gluht Nach1939Drawing and mixed media
Golden Fish1925Watercolour and mixed media
Goldfish Wife1921Watercolour and mixed media
Green Plant, Blood, Louse1924Drawing and mixed media
Hafenbild1918Mixed media
Hammamet with Mosque1914Watercolour and mixed media
Harbour with Sailing Ships1937Painting and mixed media
Hauptweg und Nebenwege1929Painting and mixed media
Heavenly and Earthly Time1927Drawing and mixed media
Heroic Fiddling1938Painting and mixed media
Heroic Roses1938Painting and mixed media
Heroic Strokes of the Bow—Mixed media
Highway and Byways1929Drawing and mixed media
Houses near the Gravel Pit1913Watercolour and mixed media
Howling Dog1928Painting and mixed media
In the Current Six Thresholds1929Painting and mixed media
In the Style of Kairouan1914Drawing and mixed media
Individualized Altimetry of Stripes1930Painting and mixed media
Insula Dulcamara1938Print
Interior with the Clock1913Watercolour and mixed media
Irma Rossa the Animal Tamer1918Drawing and mixed media
Journey in Corsica1927Drawing and mixed media
Landscape with Bluebirds1919Watercolour and mixed media
Legend of the Nile1937Painting and mixed media
Lemon Harvest1937Watercolour and mixed media
Likeness in the Bower1930Watercolour and mixed media
Limits of Reason1927Painting and mixed media
Little Hope1938Watercolour and mixed media
Magdalena before the Conversion1938Drawing and mixed media
Mask of Fear1932Painting and mixed media
May Picture1925Painting and mixed media
Monument in a Cemetery1922Watercolour and mixed media
Monuments at G1929Watercolour and mixed media
Municipal Jewel1917Watercolour and mixed media
Mural from the Temple of Longing Thither1922Print
Nach der Uberschwemmung1936Watercolour and mixed media
New Harmony1936Painting and mixed media
New House in the Suburbs—Mixed media
Old Steamboat1922Drawing and mixed media
On the Edge1930Drawing and mixed media
Once Emerged from the Gray of Night1918Drawing and mixed media
One Who Understands1934Painting and mixed media
Oriental Pleasure Garden1925Painting and mixed media
Park of Idols1939Watercolour and mixed media
Passing by Red Pillars1928Watercolour and mixed media
Persian Nightingales1917Drawing and mixed media
Popular Wall Painting1922Painting and mixed media
Prestidigitator1927Watercolour and mixed media
Rainy Day1931Watercolour and mixed media
Red and White Domes1914Watercolour and mixed media
Red Balloon1922Drawing and mixed media
Redgreen and Violet-Yellow Rhythms1920Drawing and mixed media
Refuge1930Watercolour and mixed media
Rhythmic Rythmical1930Painting and mixed media
Saint of the Inner Light1921Print
Scaffolding of a New Building1930Painting and mixed media
Scholar in Dealing with Stars1926Watercolour and mixed media
Seated Woman1930Drawing and mixed media
Senecio1922Painting and mixed media
Separation in the Evening1922Drawing and mixed media
Sinbad the Sailor1923Drawing and mixed media
Skeptically Smiling—Mixed media
Small House in the Garden City1928Watercolour and mixed media
Small Portrait of a Girl in Yellow1925Painting and mixed media
Southern Gardens1919Watercolour and mixed media
Static-Dynamic Gradation1923Drawing and mixed media
Still Life1927Painting and mixed media
Still Life with Gladioli1932Watercolour and mixed media
Strange Garden1923Drawing and mixed media
Stricken City1936Painting and mixed media
Strong Dream1929Watercolour and mixed media
Struck from the List1933Drawing and mixed media
Structural I1924Drawing and mixed media
Sumpflegende1919Painting and mixed media
Temple Gardens1920Drawing and mixed media
The Arrow before the Target1921Drawing and mixed media
The Barbed Noose with the Mice1923Watercolour and mixed media
The Flora of the Heath1925Watercolour and mixed media
The Goldfish1925Watercolour and mixed media
The Hour Before One Night1940Painting and mixed media
The Man in Love1923Print
The Mask with the Flag1925Mixed media
The Pathos of Fertility1921Print
The Rhine at Duisburg1937Painting and mixed media
The Way to the Citadel1937Painting and mixed media
Three Houses and a Bridge1922Watercolour and mixed media
Tightrope Walker1923Print
Tomb in Three Parts1923Watercolour and mixed media
Tomcat's Turf1919Watercolour and mixed media
Tower in Orange and Green1922Drawing and mixed media
Tree and Architecture - Rhythms I1920Watercolour and mixed media
Tree and Architecture - Rhythms II1920Painting and mixed media
Tropical Dawn with the Owl1921Mixed media
Tropische Dammerung1921Painting and mixed media
Twittering Machine1922Drawing and mixed media
Variations (Progressive Motif)1927Watercolour and mixed media
Ventriloquist and Crier in the Moor1923Print
Viaducts Break Ranks1937Drawing and mixed media
Villa R1919Painting and mixed media
Village Carnival1926Painting and mixed media
Vor dem Blitz1923Drawing and mixed media
Wald-Hexen1938Painting and mixed media
Young Forest1925Drawing and mixed media

What can a catalogue tell us, and what can it not?

A catalogue makes discovery possible. Klee's own register is evidence of decisions he made about naming and counting during his lifetime; the later published catalogue brings dispersed works into a scholarly sequence; an owning museum can document the material and condition of a particular object; a site directory helps a reader move among pages. Each has a different purpose and a different chance of being corrected or expanded. Treating any one list as a perfect final answer would make the other evidence disappear.[2][3][19]

The Zwitscher-Maschine editors' later addenda extend that point beyond a single case: they report newly located or identified works and, in one issue, two pieces that Klee separated from earlier compositions and recorded as independent works. Their research changes the evidence available for particular objects, even when Klee's own annual number was already known. The practical task for this site is to follow those specific identifications as they are published and match them to owner records and images, rather than infer a work's identity from a translated title alone.[22]

This is particularly important with works that have been cut, revised or worked on both sides. One reproduction may show only the face chosen for display, and one title may reflect a later curator's convenience. Research can change the account of a work without changing what the thumbnail looks like. The practical habit is simple: read the object page, compare the owner record, note the work's number and material, then consider the interpretation. Klee's diversity comes into focus when those specifics stay visible.[2][3]

Explore related guides to colour, the Bauhaus, Tunisia, late work and materials and techniques.

Discussion

Klee’s works reward looking at both image and material record.

A catalogue number or title is useful only when its source is clear.

Reader Insights

Close Looking

Which work led you to look again at its support or technique?

Context

Where did a collection record change your understanding of a work?

Open Question

Which object page or archive record would you want to check next?

Join the Conversation

Share the specific page, figure or source behind your reading.

References

  1. Zentrum Paul Klee, collection overview (English; Italian version). The institution states that around 80% of the oeuvre is work on paper and distinguishes the proportions of its own collection. These translations are one source family.
  2. Zentrum Paul Klee, archive and research (German; French version). Identifies Klee's handwritten oeuvre catalogue, the nine-volume scholarly catalogue and the successor database available on site by appointment.
  3. Zentrum Paul Klee, Fokus. Klee's versos and 2026 press kit (English), pp. 2–3. Source of the approximate 9,600/600 figures and qualified two-sided object examples; exhibition image permissions are restricted to reporting.
  4. Museum of Modern Art, Twittering Machine (English). Current material, accession and departmental records, 2019 published interpretation and provenance citing catalogue raisonné 2975; the image has an ARS/VG notice and was not newly copied, View source.
  5. Philadelphia Museum of Art, Fish Magic (English). Own-object description of the scratched black layer and muslin square. The museum limits its images to educational use absent further permission; no new image was copied, View source.
  6. Zentrum Paul Klee, Paul Klee. Ich bin Maler (German), for early technical development and layered watercolour; see also the researched Tunisia manuscript and source packet.
  7. Metropolitan Museum of Art, object evidence and Roger Benjamin's research assembled on Hammamet with Its Mosque; Zentrum Paul Klee and LACMA records distinguished on In the Style of Kairouan. These internal pages are cross-references to their separately cited primary records.
  8. Kunstmuseum Basel, owner record and scholarship assembled on Crystal Gradation; work 1921,88, inv. 1968.407. The exact image is from Rawpixel's item-level CC0 page; source/master/derivative ledger kept in this project.
  9. Kunstmuseum Basel, owner record and scholarly reading on Ancient Harmony. Original Alter Klang, 1925,236, with its physical support rather than an inferred musical code, View source.
  10. Solomon R. Guggenheim Museum, owner and provenance evidence on Red Balloon; its medium remains qualified in the researched page, View source.
  11. Kunstmuseum Basel, owner record on Senecio; Museum of Modern Art, own record on Cat and Bird. The dedicated pages separate object fact from psychological reading.
  12. MoMA, Twittering Machine record; Kunstmuseum Basel, Senecio record; see references 4 and 11. Distinct object accounts underlie the comparison, not a general style label.
  13. Museum Ludwig and specialist sources assembled on Highway and Byways. Its original title and 1929 number are kept distinct from other path works, View source.
  14. Kunstmuseum Bern, Ad Parnassum (English); work-specific research and image boundaries on the object page.
  15. Kunstmuseum Basel and related sources assembled on Fire in the Evening. This is a bounded cross-work comparison, not a shared-medium claim, View source.
  16. Zentrum Paul Klee and owning institutions assembled on Death and Fire, Struck from the List and late work. Distinguishes documented context from suggested meaning.
  17. Museum Folkwang, current record and historical source comparison on Fire at Full Moon. Its medium and dating qualifications are kept in the work page, View source.
  18. Rawpixel, Crystal Gradation item, marked CC0/free for personal and business use; original 300 dpi master, 1024 px/144 dpi/JPEG-80 derivative and visual match logged in the project image-rights ledger. Public credit remains useful despite no required licence credit, View source.
  19. Christoph Zuschlag, “Paul Klee und die ‘Entartete Kunst’”, Zwitscher-Maschine 4 (2017; German), for annual no. 1922,151. Compare MoMA provenance's published-catalogue no. 2975 and accession 564.1939; the printed catalogue entry itself remains unread, View source.
  20. The History of Art, local catalogue-entry audit, 26 September 2026 (project record), of A–G, H–S and T–Z display names, active links and legacy redirects. It records site structure, not object identity. Representative live redirect chains still require designated release-lane verification.
  21. Christian Rümelin, “Klees Umgang mit dem eigenen Œuvre”, in Roland Doschka, ed., Paul Klee: Jahre der Meisterschaft 1919–1933 (2001), pp. 21–37, 215–22 (German full text): Klee's register, duplicate copies, retrospective entries, changing titles and work-process chronology. The author-uploaded transcription has some OCR errors; specific examples were checked in context. This study draws on the published catalogue project but is not a substitute for directly reading its nine volumes, View source.
  22. Osamu Okuda and Walther Fuchs, “Neu entdeckte/identifizierte/publizierte Werke: Addenda zum Catalogue raisonné Paul Klee”, Zwitscher-Maschine 11 (2022), pp. 122–123 (German), DOI 10.5281/zenodo.6406689: direct online text and object data for the rediscovered Burg 2, 1923,107, catalogue no. 3201, with a comparison to Burg 1. The editors' account for issue 12 describes further addenda, including two works separated by Klee from earlier compositions. These accessible updates do not amount to direct reading of the nine printed volumes.