7/15/2004: Light-transmitting concrete

[Undertoad]

Now what I want from this is A) a way to make the light one-way, and B) a switch to turn it on and off. Then they could make entire sides of buildings out of this, and save on energy costs by selectively using it for lighting during the day, and allowing light in for heat where appropriate, while still preserving privacy. Computer-control it to get the maximum out of the heating possibilities, on a room-by-room basis.