Graphic artist who created realistic images of the impossible, such as his famous drawing, Relativity, in which stairs overlap and intersect.
After being placed in a special school due to illness as a child, he failed second grade, although he excelled in drawing.
He also worked in woodcuts and mezzotints.
Married Jetta Umiker in Italy, in 1924; the couple settled in Rome.
He was an artist born in the Netherlands, much like Vincent Van Gogh.