One of my first sculptures was made of bicycle parts. I was living at that time in a attic in the red light section of Amsterdam. I started to work without any specific materials. I was looking in the street like when I was a young boy, in the garbage cans, for ropes, wires, and paint. I left my parents in 1940. Years later I saw an exhibition of Kurt Schwitters at the Stedelijk Museum in Amsterdam curated by Willem Sandberg and there I saw the real 'objet trouvé'; until then I had never heard about it. Schwitters was a shattering experience.

p. 79 'Quotes', K. Appel (1989) - 'Karel Appel – the complete sculptures,' (1990)