As our kids get older and able to undertake more complicated projects, I tend to forget about how much fun they have just simply puttering around. Cami has been asking for lots of sensory play lately (not her words, but those are the activities she means) and both kids have been interested in Harry Potter again, so they asked for a Potions Station on a recent playdate. As we'd never put one of those together, I just kind of went with whatever we had at home, giving some thought to the kinds…