I no longer do art on the cart, but when I did, I was able to find a daddy who
was a cabinet maker. He made me a rolling cabinet with a formica top and both
sides of the cabinet locked. This would only be a solution for someone working
on a single floor, however. If this weren't possible, maybe just covering the
whole thing with a quilt while you're gone and a sign attached: Art supplies for
Art classes: Please do not borrow anything on this cart.