Ever wonder what to do with all those boxes of cornstarch you have just laying around? Try making cornstarch feelies! I highly recommend it. We've done it several times on a small scale, just enough to play with in your hands. I've wanted to do enough to walk on for a long time. I was wanting to fill a kiddie pool with the stuff, but after doing a bit of calculation, I realized that it would take like 100 or so boxes. Not too cost effective. However I did blow 13 boxes at once here. It was great fun!
The cool thing about cornstarch feelies is that it really isn't a solid, but it's a weird kind of liquid. See, it's a surface tension thing. As long as you hit it fast, it feels solid. You can run and jump on it. But the second you stop moving, you sink into it like a liquid. When you roll it around in your hands, it will roll up like a ball, and it feels really solid. As soon as you stop rolling it, it runs all our of your hand just like any other liquid.
The formula is about 1 part water to 1.75 part cornstarch (give or take a little). That's about 1 2/3 cup water per 1 lb box of cornstarch. It does seem to dry out pretty quickly as you play with it, so you'll have to add a little water as you go. Give it a try! We love it. Oh, and here's a hint: A box of cornstarch at Shop -n- Save will run you about $1.40, but you can get one at Wal-Mart for $0.84. I haven't checked the Aldi, Save-a-Lot type stores yet.