A balanced ecosystem in a sealed glass sphere. Composed of a few shrimp, a sea fan, algae, decorative shells, and gravel in water, the Ecosphere is a spin-off from NASA’s research on self-contained communities for human space exploration. According to its makers, it can maintain a living environment for up to 20 years without the need for maintenance. EcoSphere®, by EcoSphere Associates; USA, 1982.