Definition
*Placuna placenta* is a species of bivalve mollusk known as the windowpane oyster. Its shells are thin, flat, and translucent, resembling panes of glass. 🪟 They're primarily found in the Indo-Pacific region, especially the Philippines. They are filter feeders, consuming plankton and organic particles. Historically, the shells have been used as a glass substitute in windows and lamps. Think of them as natural, sustainable window material.