i collect kaleidoscopes, and also have several teleidoscopes, and a karascope.
the karascope is tube similar to standard kaleidoscopes, and it has bits of glass at one end. (and internal mirrors, too.)
the bits of glass in a karascope are clear, flat disks of various sizes. each one is polarized. thus, each allows only a certain limited percentage of light to travel through it.
depending on the light sourse--be it natural(white) light, or halogen, incandesent, or floresent, the disks will filter out certain frequencies, and appear to change color.
it's a very interesting effect. i have halogen, florescent, and incandesent lights in use in my home, as well as a 'black lights'. by using different light sources (or a mix!) for viewing, the karascope changes quite radically in how 'colorful' it is.
some artificial light sources are quite white (that is, they offer almost a full spectrum of color) other artificial light sources are warm (they have a large percentage of Red/orange /yellow light (but almost no green/blue/violet.) and some are 'cool' (mostly blues/indigo/violet).
on my sunniest window, i have 3 different prisms--and often have rainbows arcing across the room. (i keep a large (10 inch square) flat (plastic) fresnel lens handy, too, for fun.
i have also build kaleidoscopes from kits, and i have another set of mirrors to build another kaleidoscope--not a kit, just the mirrors.
i am enamored by light, and color (as an aspect of light).
teleidoscope
