For every commercial work released by an artist, countless doodles and sketches remain in sketchbooks, unseen by all but a select few. It is a rare treat to see an artist's looser, more playful experiments. These early drafts and creative diversions can reveal new facets of the artist's process, and often constitute a body of work just as valuable as what the artist deems worthy of the public eye. The Art of the Sketchbook cracks opens the covers of more than thirty private sketchbooks and reveals the personal work of artists in their leisure.