Scott Bennett from writes:

I’ve had a sample of this stuff sitting around on my desk for a few years now, just waiting for the chance to use it. That chance still hasn’t come for me, but maybe you can think of something. Alusion is the trade name for Cymat’s “stabilized aluminum foam” product. The best way to describe it is as a sort of aluminum sponge. Using a patented process, the manufacturers take a molten aluminum metal matrix composite (made from recycled aluminum) and aerate it, then cool it to preserve the bubbly cellular structure. Being mostly air, the finished product weighs almost nothing. It looks like metallic volcanic rock.

Alusion is available in 4′ x 8′ sheets either 1/2″ or 1″ thick, with two different cell sizes. The raw product straight off the line has a thin aluminum skin on the faces, but it’s also available with the skin removed from one or both sides to give an open cell or translucent effect. Cymat also offers the option of encasing the whole thing in clear resin.

The best part — it’s made from post-industrial aluminum and is fully recyclable (except for the resin-encased version).