Glasses-free stereo
Image broken into sets of vertical strips
Each set is a different eye-view
Lenticular - lens-like stripes
Barrier strip (PHSCologram, Synthagram, etc) - separate layer with strips that block all but one image from any viewpoint
If you're interested in seeing one, CCR has a PHSCologram on display in one of their windows facing the hallway (lower floor of Norton Hall).