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Piet Klaasse (Sloten, 1918 - Eemnes, 2001) was a Dutch illustrator, watercolorist, graphic artist, graphic designer, lithographer, painter, draftsman, drawing teacher and child prodigy.
Piet Klaase has been drawing since his childhood, filling his sketchbooks.
At the age of eleven he was already performing as a speed artist; Klaasse, as the 'youngest speed artist in the world', made speed drawings during the children's performances in the Kurhaus.
He taught for 34 years at the Rietveld Academy and its predecessor, from 1947 to 1981. Klaasse called himself a “primitive follower of observation”.
He gained great fame with his drawings and watercolors of horses and jazz musicians.
Often drawn on the spot. Drawing something well always required the greatest effort from him, as he stated. He worked on his drawings for an endless time. Sometimes he changed something just before the opening of an exhibition.