Klemens Torggler's door is an invention based on rotating squares, The special construction makes it possible to move the door sideways without the use of tracks. This technical trick opens up new applications for the door.

Turkeys strut, peacocks preen, and bowerbirds design. Of all the strange things that male birds do to attract a mate, the bowerbird's ritual is the only one that could make it into the MoMA. They use two distinct types of "architecture" and have a keen eye for color as well.