Problem: Paul Klee (German: [paUl 'kle:]; 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.

During his twelve-day educational trip to Tunis in April 1914 Klee produced with Macke and Moilliet watercolor paintings, which implement the strong light and color stimulus of the North African countryside in the fashion of Paul Cezanne and Robert Delaunays' cubistic form concepts. The aim was not to imitate nature, but to create compositions analogous to nature's formative principle, as in the works In den Hausern von Saint-Germain (In the Houses of Saint-Germain) and Strassencafe (Streetcafe). Klee conveyed the scenery in a grid, so that it dissolves into colored harmony. He also created abstract works in that period such as Abstract and Farbige Kreise durch Farbbander verbunden (Colored Circles Tied Through Inked Ribbons). He never abandoned the object; a permanent segregation never took place. It took over ten years that Klee worked on experiments and analysis of the color, resulting to an independent artificial work, whereby his design ideas were based on the colorful oriental world. Fohn im Marc'schen Garten (Foehn at Marc's Garden) was made after the Turin trip. It indicates the relations between color and the stimulus of Macke and Delaunay. Although elements of the garden are clearly visible, a further steering towards abstraction is noticeable. In his diary Klee wrote the following note at that time: In the large molding pit are lying ruins, on which one partially hangs. They provide the material for the abstraction. [...] The terrible the world, the abstract the art, while a happy world produces secularistic art. Under the impression of his military service he created the painting Trauerblumen (Velvetbells) in 1917, which, with its graphical signs, vegetal and phantastic shapes, is a forerunner of his future works, harmonically combining graphic, color and object. For the first time birds appear in the pictures, such as in Blumenmythos (Flower Myth) from 1918, mirroring the flying and falling planes he saw in Gersthofen, and the photographed plane crashes. In the 1918 watercolor painting Einst dem Grau der Nacht enttaucht, a compositional implemented poem, possible written by Klee, he incorporated letters in small, in terms of color separated squares, cutting off the first verse from the second one with silver paper. At the top of the cardboard, which carries the picture, the verses are inscribed in manuscript form. Here, Klee did not lean on Delaunay's colors, but on Marc's, although the picture content of both painters does not correspond with each other. Herwarth Walden, Klee's art dealer, saw in them a "Wachablosung" (changing of the guard) of his art. Since 1919 he often used oil colors, with which he combined watercolors and colored pencil. The Villa R (Kunstmuseum Basel) from 1919 unites visible realities such as sun, moon, mountains, trees and architectures, as well as surreal pledges and sentiment readings.

What type of paint did he use?

Answer with quotes: watercolor paintings,

Question:
Johann Christian Friedrich Holderlin (German: ['jo:han 'kRIsti.a:n 'fRi:
Holderlin began his education in 1776, and his mother planned for him to join the Lutheran church. In preparation for entrance exams into a monastery, he received additional instruction in Greek, Hebrew, Latin and rhetoric, starting in 1782. During this time, he struck a friendship with Friedrich Wilhelm Joseph Schelling, who was five years Holderlin's junior. On account of the age difference, Schelling was "subjected to universal teasing" and Holderlin protected him from abuse by older students. Also during this time, Holderlin began playing the piano and developed an interest in travel literature through exposure to Georg Forster's A Voyage Round the World. In 1784, Holderlin entered the Lower Monastery in Denkendorf and started his formal training for entry into the Lutheran ministry. At Denkendotf, he discovered the poetry of Friedrich Schiller and Friedrich Gottlieb Klopstock, and took tentative steps in composing his own verses. The earliest known letter of Holderlin's is dated 1784 and addressed to his former tutor Nathanael Kostlin. In the letter, Holderlin hinted at his wavering faith in Christianity and anxiety about his mental state. Holderlin progressed to the Higher Monastery at Maulbronn in 1786. There he fell in love with Luise Nast, the daughter of the monastery's administrator, and began to doubt his desire to join the ministry; he composed Mein Vorsatz in 1787, in which he states his intention to attain "Pindar's light" and reach "Klopstock-heights". In 1788, he read Schiller's Don Carlos on Luise Nast's recommendation. Holderlin later wrote a letter to Schiller regarding Don Carlos, stating: "It won't be easy to study Carlos in a rational way, since he was for so many years the magic cloud in which the good god of my youth enveloped me so that I would not see too soon the pettiness and barbarity of the world." In October 1788, Holderlin began his theological studies at the Tubinger Stift, where his fellow students included Georg Wilhelm Friedrich Hegel, Isaac von Sinclair and Schelling. It has been speculated that it was Holderlin who, during their time in Tubingen, brought to Hegel's attention the ideas of Heraclitus regarding the unity of opposites, which Hegel would later develop into his concept of dialectics. In 1789, Holderlin broke off his engagement with Luise Nast, writing to her: "I wish you happiness if you choose one more worthy than me, and then surely you will understand that you could never have been happy with your morose, ill-humoured, and sickly friend," and expressed his desire to transfer out and study law but succumbed to pressure from his mother to remain in the Stift. During his time in the Stift, Holderlin was an enthusiastic supporter of the French Revolution; he and some colleagues from a "republican club" planted a "Tree of Freedom" in the Tubingen market square, prompting Charles Eugene, the Duke of Wurttemberg himself, to admonish the students at the seminary.
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Did any famous persons study with him ?

Answer:
where his fellow students included Georg Wilhelm Friedrich Hegel, Isaac von Sinclair and Schelling.