Caddisfly larvae live in streams and other fresh water sources, housing themselves in tubes they have created from items in their natural environment. Using sand, pieces of shell, etc., the caddisfly, a close relative of the butterfly, uses silk to connect and upholster their protective tubes. A naturalist at heart, Mr. Duprat experimented with the larvae, placing them in a home aqaurium with pieces of gold, gold rods, semi-precious, and precious stones. They immediately went to work, creating this: