A sketchbook is a book or pad with blank pages for sketching and is frequently used by artists for drawing or painting as a part of their creative process. Some also use sketchbooks as a sort of blueprint for future art pieces. The exhibition of sketchbooks at the Fogg Art Museum at Harvard University in 2006 suggested that there were two broad categories for classifying sketches:
- Observation: this focuses on the documentation of the external world and includes many such travel and nature studies and sketches recording an artist's travels.
- Invention: this follows the artists' digressions and internal journeys as they develop compositional ideas.
