I Want Some Magic Sand

I'm not sure how this passed me by before, but I really want some Magic Sand.

Basically, it's hydrophobic sand, so it repels water. In air it is free flowing, but in water it clumps together and be modelled with. There's lots more on magic sand at the Journal of Chemical Enducation's website.

You can buy magic sand at Argos if you want to have a play about with it.