One of my favorite pieces at the Ai Wei Wei exhibit are the giant Moon Doors. At a distance it seems that they are just large rectangular boxes lined up in a row. But when you peer through at just the right angle, you see the phases of the moon.
By itself that is really cool, but add the extra element of people, and it is really a remarkable sight. The team at Roundpeg had fun peaking through the phases looking happy, thoughtful and mysterious.