I keep a rolling art cart ready — two trays of washable tempera cakes, a stack of 12x18 butcher paper, masking tape, clothespins, and a cup of stubby brushes — so I can turn the dining hall into a studio in under five minutes where kids rotate through tape-resist, texture rubbings, and a collaborative mural. What do you stock to keep it truly hands-on and expressive without turning the floor into a slip-n-slide?