Cloud Dough - (the stuff at hands on museums) 8 cups flour & 1 cup baby oil. It feels like flour as you run your fingers through it, but it's mold-able. A wonderful sensory activity for children. So cool. I made this for the kids and with only 1 c. oil, didn't want to hold form really well so I kept adding oil till it did (about 1/3 c. extra)...so cool- guess similar to moon sand- either way, they were out there playing for a long time.