He had filled his first sketchbook in January 1904 in Bonn, even before starting at the Düsseldorf Academy. Macke's passion for capturing the fleeting images of his daily environment seem to have made him want to reord everything that happened in his notebooks. In his short life he was to fill a total of seventy-eight sketchbooks with more than three thousand pages, most of which he used on both sides. The importance Macke attched to his drawing can be ascertained from a letter he wrote to his mother in 1904:"When I'm on the street I almost always have my sketchbook to hand. This will help me learn how to do animals and people properly. That's something no professor can teach you - and yet it's the most important thing of all."