It would be cool to encase aliens without contaminating the water somehow. Fiberglass water storage tube tanks for passive solar heating & cooling system Trombe walls. Prevent temperature swings in greenhouse or sunroom by storing excess solar energy.
this is pretty much exactly how we are builing our retirement home in SC. Only it will be a little deeper but all spaced will be completely open to the windows in the front creating bay-like sections in the home for different rooms.
Use this in mini greenhouse for "rotation planting transplants"? The thermal "battery" in a passive solar greenhouse - barrels of plain old water on the north wall of the structure. Warmed by day, they release their heat at night.
Solar-powered Bush House exemplifies chic eco-friendly living in the Australian outback