OV has a terrarium in a bottle, this can be found on the windowsill in Center of Excellence. In the long term it is planned to be sealed, in order for it to become a closed cycle of water that can hopefully survive the potential lack of love from future board members. For now it is open, and watered regularly. It is not quite a biosphere, but more or less spheroid in shape.
From bottom:
A mix of gravel and activated charcoal. Stores water and filters out pollutants.
A layer of semi-alive moss. Serves as living biomass and nutrient source
A mixture of organic matter, minerals, gases, liquids, and organisms that together support life.[1]
Various plants have been introduced to the terrarium. Since soil and samples from various sources including outside have been introduced, it is assumed that a variety of microorganism live in the Biospheroid.
Known things
Less specified things