[divia]

Interesting. That makes me want to try an anechoic chamber :-). However, the flotation tank also has body temp air and water, no light, good soundproofing (I've also always gone in wearing earplugs). It's true that if I were splash inside, I'd probably hear it some, and that if I floated to the side, I'd feel the edge. But when I went floated, I always lay as still as I could for the whole time, which was pretty still. So I don't really see what would make it all that different, other than maybe the fact that you're lying down instead of sitting.