Latent effects projection systems that allow a latent effects projector to
be used in connection with various materials, such as wall pieces, floor tiles,
signage, hangings, and the like; use reflective polarizers having various looks
and/or which allow for the development of different color palettes; which are relatively
insensitive to heat; and/or use plural retarders to generate relatively more saturated
colors and/or latent colors that are substantially repeatable.