Can we do that?

I am in the process of making a "creation station" in our basement, where the kids will be able to create, explore and invent. I bought lots of craft materials to put in the station so Isaac can go down and experiment on his own. The problem started when he saw some of the things I had purchased and wanted to do everything right away. I decided to let him do a couple of the all-ready-to-go crafts.... making bead bowls and plaster. All I heard all day was, "Can we do that?"