We used to submerge this LED remote controlled lamp into that square glass vessel. ; It worked well until the condensation inside the LED shorted out the electronics & you don't need to guess what happened next. This was because the vessel is filled with water beads, the kind that swell up from a pin head size to a pea size when you add water. The idea came to put the LED underneath to get the same effect. The bottom & top pieces of wood are out of the same piece, I think it's maple. The hole in the bottom piece is at the same depth as the thickness of the LED lamp & slots were machined to fit the top & bottom to hold the glass in place. ; Finished with wipe on poly. Thanks for looking.
We used to submerge this LED remote controlled lamp into that square glass vessel. 
;
The idea came to put the LED underneath to get the same effect.
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