Being Christmas, I was thinking about how good it was this year not to have to spend 8 hours travelling to Hobart, now that the in-laws have moved back to Wellington.
Anyways, it reminded me of the fish tank that was at Melbourne airport, which is still an unexplained technological mystery for me..
Every few minutes the water or glass instantly become opaque, then a few minutes later would instantly clear. I'm not aware of any technology that would give that effect.
Surely one of you geeks can shed some light on how it worked? Was it a real fish tank?