This was a hoot! It's incredibly simple and easy to do. Start with 1/3 cup of water, add a few drops of food coloring, and then slowly shake in 3/4 cup of corn starch. Let it stand for a couple of minutes so that the starch absorbs as much water as it can. Don't stir the mixture. Now pour it into your hand and start to play with it. When you apply pressure the goop sets into a hard form but when you release the pressure it reverts to liquid. Just make sure to put down paper before you begin because this concoction is bound to make a mess!