Latest issue of Carolina Gardener featured disappearing fountains. I said to myself, "I have a pot I could use for that!", so I assembled an old Beckett fountain pump, some refrigerator shelving, an old mortar mixing tray, some tubing and silicone II caulk, and some river rocks and dug a hole. Here is the result...
The water runs down the sides of the pot into the mortar mixing tray below and is pumped back up through the pot. Water is kept clear with a little Clorox. Evaporation is replaced via dripper tubes attached to a clock run irrigation system.