Vashti is a girl who believes she can't draw. When her art teacher notices that she left her assignment blank, Vashti is instructed to just "make a mark and see where it takes you." Vashti is only able to make a small dot on her paper, but to her surprise, the teacher asks her to sign it and displays it in her office the next week. Believing that she can do better than just that, she starts drawing multiple, more elaborate and colorful pieces centered around the dot motif, earning widespread attention and realizing that she is indeed an artist.
Later in life, Vashti encounters a young boy who believes he can't draw. After he claims that he can't even draw a straight line, Vashti asks him to try his best at making one. While the result is imperfectly squiggly, she nonetheless instructs him to sign it, starting a whole new adventure in the process.