SB-800 with a Chimera, fired from the left at 1/32 with a bounce on the right. Manually fired, no sound trigger (yet, but it's coming). The base is a 24" x 30" piece of glass with the underside painted white to keep the high reflection attributes of the glass. I kept the water in by adding 1" side walls around the edges. Total cost about $8 at Home Depot. See the set-up here.