Lieske Schreuder makes brightly colored threads and tiles out of snail excrement. She feeds a farm of hundreds of snails colored paper, and they poop out little colored pellets of snail excrement: ...

Gabriel Dawe's "Plexus" series is hard to describe, but even harder to photograph--think of it as weaving in colored thread in the air. (Courtesy Newark Museum) When Gabriel Dawe was growing up in ...