G+55+0 Revolving window illusion.
G+55+5 Rotating disk and strobe demonstration.
G+55+10 Optical illusion posters.
G+55+15 Phantom Bouquet: Real image from a concave mirror.
G+55+20 Clam shell mirrors: Floating coin illusion.
G+55+25 Indices of Refraction: glass in glycerin and phantom crystals.
