Several local museums have a room with a phosphorescent paint on the wall, a light on a timer and instructions allowing you to 'freeze' your shadow. That is fun.
Standing still and moving your head around while the light is on so that your shadow ends up looking like a headless person is really fun.
CMOST does not have such a room, what they have is a tiny piece of this wall with a black curtain just in front of it and a couple of tiny LED flashlights. Writing on the wall in phosphorescent trails is really really fun. Pictured is Exile #3 getting into the swing of it. CMOST may not have much space, but they have the coolest ideas!