Bryan Johnson-French puts the finishing touches on the newly cleaned Circus set. Most of the large sets are open at the top. The display heights exceed the height of the plexiglass, which makes keeping them clean a challenge, and changing the casework would alter Alexander Girard’s original design. Girard covered the surface of most platforms with sand, which the team anticipated would be very difficult to clean. They discovered, however, that they could lift most of the dust by gently laying dry Swiffer pads on the sand several times.