I need an idea of adding a missing link in art?

I'm supposed to draw something that is like a missing link, and no, no evolution. One thing that can miss anything, but may not be obvious. Can anyone give me ideas?

can draw anything from a tree drawings or animated sequences of mathematical geography, the trick is well draw something very common that people do not pay much attention or something completely unknown and keep in the dark. This site may provide more ideas http://images.google.com/images?hl=en&q=photos+of+missing+link+art&um=1&ie=UTF-8&ei=ewcOSrvHO4KJtgevq7D6Bw&sa=X&oi=image_result_group&resnum=1&ct=title

Bent Objects: Hilarious Food Art