What is the purpose of thumbnail sketches?

Thumbnail sketches serve as quick, small-scale visual representations of ideas or concepts, allowing artists and designers to explore compositions, layouts, and forms without committing to detailed work. They facilitate brainstorming and experimentation, making it easier to iterate on concepts rapidly. Additionally, thumbnails help in organizing visual elements and clarifying thoughts before moving on to more refined designs. Overall, they are a crucial tool in the creative process to visualize and refine ideas efficiently.