this idea a couple of weeks ago via pinterest, and we tried it out on a rainy day last week. SO GOOD. FT mixed it up (with a little help from me, of course) and then proceeded to play with it for a solid 45 minutes. When he was done I scooped the dough into a bowl, wrapped it in plastic, and popped it in the fridge. This morning we pulled it out again, and as of right now he's been playing for a solid hour and a half.
The mess is definitely present, but since it's cornstarch (as opposed to flour) it's pretty easy to clean up. Anything that keeps my kid occupied with minimal supervision for more than an hour? WINNER. Save this one, mamas.