Evan (in yellow) and Alex (in red) rearrange a few bottomless wooden boxes into a changing variety of play props that have qualitatively different functions: a train to sit in, a tunnel to crawl through, a bridge to walk over, an enclosure to hide toy animals inside, and a chute to toss a ball into. When a child is able to change the function of an object by changing his perspective on that object, he learns an important lesson. When I want a new function, I do not have to discard the object. I can change the object instead of exchanging the object (see Constructive Play by G. Forman and F. Hill).