Strange Parts

There have been a lot of strange Lego pieces in sets like Mindstorms NXT and Bionicle. Throwbots had unique arms that were made for launching discs.

 Whenever the designers cant figure out how to make a certain part of a set, they make prototypes of a new piece. Sometimes, the designers find alternate uses for existing pieces like putting a piece upside down. Very many sets use this concept. Professor Snape in Harry Potter had a glow in the dark head.