Terrarium is an interactive, sonic ecosystem whose source of energy comes from the sounds people make interacting with the work. The sounds of the participants voices come into the world via the sound vents. These sounds are too raw for the environment so they are sucked in by the Seed Spitters who process the sounds to more manageable particles which are then expelled into the environment. These processed sound particles help spawn and sustain life within the ecosystem, providing food for the fish in the water and creating frequency sensitive plants on the land. The voice also triggers changes to the Pattern Bush who adapts the shapes of its leaves to the sounds it hears.