Question: Klaus Bietenholz was an admirer of what Swiss-German artist who wrote "Writings on Form and Design Theory?"

Context paragraphs:
Jost Amman: Jost Amman (June 13, 1539 – March 17, 1591) was a Swiss-German artist, celebrated chiefly for his woodcuts, done mainly for book illustrations.

René Luckhardt: René Luckhardt (born 1972) is a Swiss-German artist.  Luckhardt holds a Master of Fine Art degree in Painting from Chelsea College of Arts, London.  His practice draws from the peculiar and unconscious.  He counts Lewis Carroll and Aleister Crowley among his influences.  2010 he reproduced the latter's "Chambre des Cauchemars" of the Abbey of Thelema in a gallery space.  Moreover, he built a life-sized grandmother doll.  In 2010 he initiated the international avant-garde salon Wonderloch Kellerland in Berlin of which a satellite existed in Los Angeles.  Both spaces are included in the Art Spaces Directory of the New Museum, New York.  In 2013 a retrospective of his early Kellerloch Paintings was held in Berlin.  Luckhardt frequently uses art history by re-contextualizing various positions and presenting them with a surprising twist.  Also, he is co-author of HER.

Spaces (Violeta de Outono album): Spaces is the seventh studio album by Brazilian psychedelic rock band Violeta de Outono, released on October 14, 2016 through Voiceprint Records.  The band began work on the album circa June 2016, but it wouldn't be officially announced until September 19, 2016, when they uploaded a short teaser on their official YouTube channel; later on, a lyric video for the track "A Painter of the Mind" was uploaded on October 5, 2016.  The album is an homage of sorts to Swiss-German artist Paul Klee (1879–1940); it uses a sketch made by him as its cover art, and the lyrics to "A Painter of the Mind" consist of many excerpts of some of his poems.

C-K theory: C-K design theory or concept-knowledge theory is both a design theory and a theory of reasoning in design.  It defines design reasoning as a logic of expansion processes, "i.e." a logic that organizes the generation of unknown objects.  The theory builds on several traditions of design theory, including systematic design, axiomatic design, creativity theories, general and formal design theories, and artificial intelligence-based design models.  Claims made for C-K design theory include that it is the first design theory that:

Klaus Bietenholz: Klaus Bietenholz (born December 29, 1924) is a Swiss painter.  Over the years he has painted over 300 art pieces.  An admirer of Paul Klee, Juan Gris, Alexander Calder, and César Manrique, his painting style has been described as "Organic-Cubism" by Dominique Vernier.

Anne Marie Schleiner: Anne-Marie Schleiner (born 1970) is a theorist, an educator, a new media and performance artist, a hacktivist, a scholar, a gamer, and a curator.  Her work is focused on gender construction, ludic activism, situationist theory, political power struggles, experimental gaming design theory, urban play, the United States Military, avatar gender reification, the global south, and feminist film theory.

Design U: Design U is a Canadian television series which premiered on April 4, 2005 on HGTV (Canada).  Produced by Mountain Road Productions the series takes the design-clueless back to school for a crash course in interior design.  After one intense day with a professional designer—learning the ins and outs of design theory—the design student gets to test their newly acquired design savvy during a two-day makeover.  With $3000 and a team of renovators at their disposal, the student has to transform one room in their house.  At the end, the design professor returns to review the results to see if the student makes the grade.

Paul Klee: Paul Klee (] ; 18 December 1879 – 29 June 1940) was a Swiss-German artist.  His highly individual style was influenced by movements in art that included Expressionism, Cubism, and Surrealism.  Klee was a natural draftsman who experimented with and eventually deeply explored color theory, writing about it extensively; his lectures "Writings on Form and Design Theory" ("Schriften zur Form und Gestaltungslehre"), published in English as the "Paul Klee Notebooks", are held to be as important for modern art as Leonardo da Vinci's "A Treatise on Painting" for the Renaissance.  He and his colleague, Russian painter Wassily Kandinsky, both taught at the Bauhaus school of art, design and architecture.  His works reflect his dry humor and his sometimes childlike perspective, his personal moods and beliefs, and his musicality.

Literaturwurst: Literaturwurst ("Literature Sausage") is an Artist's book, made by the Swiss-German artist Dieter Roth between 1961 and 1974.  Each book was made using traditional sausage recipes, but replacing the sausage meat with a book or magazine.  The cover of the edition was then pasted onto the skin of the sausage and signed and dated.

Angelus Novus: Angelus Novus (New Angel) is a 1920 monoprint by the Swiss-German artist Paul Klee, using the oil transfer method he invented.  It is now in the collection of the Israel Museum in Jerusalem.

Supporting paragraphs: Klaus Bietenholz Paul Klee
Answer: Paul Klee