The walls of a house would be two panes of thick glass, with water and fish in between. One could place coral or rocks in the tanks that comprise the outer walls, for privacy. Added plus... lets in light from outside... no need for windows!-- Malakh, Jun 14 2001 Marine Life Double Glazing http://www.halfbake..._20double_20glazingHalfbaked already - and baked by Mr G. Normal [hippo, Jun 14 2001, last modified Oct 05 2004] This idea would tank in the UK although it could work somewhere wth a fairly invariant climate.-- Aristotle, Jun 14 2001 It would work (and is baked) for interior walls, however. I'd like a bathtub the sides and bottom of which would be an aquarium - perhaps running up the length of the wall.-- phoenix, Jun 14 2001 I've seen this for interior walls, but I was thinking outside too. Oh, and I didn't think of winter.. I live in nice subtropical Tampa... Hmm. [hippo]'s link is quite similar. Someone can [mfd] this if wanted.-- Malakh, Jun 14 2001 I live in Tampa too...Problem is that the water would heat up so quickly that you'd have walls full of fish soup...would have to either cool the water or circulate it really quickly to keep it from heating up...-- StarChaser, Jun 14 2001 I once ran an optics experiment where I shone a 1kW light through lots of very expensive and delicate optical equipment. To avoid frying the kit I used a large tank of water between the light source and everything else which filtered out most of the IR. When the water started to boil I knew it was time to go and do something else for a bit...-- hippo, Jun 15 2001 Would be very cool to see but the outside glass pane would be covered with Algae within 2 days so it would defeat the purpose of seeing from outside, You might also have a huge problem with temp. changes in the water fish don't like that too much. Maybe if it was installed on the shady side of the house. Another problem would be oxygen for the fish the surface area of the open part of the tank would be too small for the depth. I voted for it because i wish it could be feasable to do, but it's not:(-- mawgadog, Sep 06 2005 random, halfbakery