When a 1L bottle is shaken, the blue and white beads mix within the liquid. When allowed to settle, the the beads separate, white at the top and blue at the bottom. However, shortly the two separated colored beads slowly come together until they meet in the center of the liquid, white on top of blue.

A bocci (alt. spell :bocce, boccie, boccia (singular)) ball hanging from a scale that reads Newtons is lowered into water. Details are in the file cabinet where Demos are filed by DCS number.

Balanced sealed globe tips the scales towards it under bell jar during evacuation.

Squeezing and releasing narrow edges of bottle makes diver rise or fall.