Given a handful of small objects in a bag, student will identify what he has, using cognitive processes - sensation, perception, thinking, reasoning, or memory. Using light from an overhead projector, make hand-shadows. Dust helps us see light beams. A flashlight beam is directed at a mirror square on the floor. Make chalk dust and sprinkle near the beam.
Dust bounces from the beam to the ceiling where the mirror reflects.
Various angles can be used and observed. A Light Trick. A bright light is projected on the mylar from above. The mylar now appears as a dark spot. Changing the height of the mylar gives more fun.