What do you do when you need to think through visual ideas, a story or an interactive exercise? One of the best techniques I know for design and generating ideas is to create small rough sketches, known as thumbnail sketches or just thumbnails. A thumbnail is a quick drawing of an idea—just enough to allow you to think things through. The term thumbnail reflects the idea that these sketches are small.
What is a thumbnail sketch?
Thumbnails are typically small rapid drawings that help you think through an idea.