I went back to the Oakland Museum, hoping to snap photos of Michael McMillen's Aristotle's Cage, which you'll recall that I liked. By the door to that piece of art was a little sign: there's a McMillen show coming up, starting in Mid-April. And a couple of pieces are already open. One of them, the Pavillion of Rain, is a little shack that you can enter. It's raised up over a pool of water; sprinklers send down rain from above (on a 15 minute cycle). The roof leaks, but their are gutters and funnels to send the water back outside again. The boundary between the shack's "inside" and "outside" is discontinuous.