Italian/American designer (his slash, not mine) Gianluca Gimini asked people to draw a men’s bicycle from memory. Although it’s a form that is familiar to most people, it’s surprisingly hard to draw. (It’s also, as he points out, an interesting exercise in epistemology. Even though we “know” what a bicycle is, and how it works, that’s rarely sufficient for drawing a functional diagram.)
On the other hand, the non-functional diagrams people gave him were often beautiful, and as imaginative product designs. he realized that they go far beyond what any one designer could ever hope to dream up. So he rendered the bicycles in photo-realistic images, which are both weirdly fascinating and beautiful. Check out his “velocipedia” for more.