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A Judith Karelitz 1978 Karascope. Outer tube measures 29.5cms long. Inner tube a tight fit so approx same size.
The outer tube says:
"The Karascope creates an optical fantasy in a tube by polarizing, refracting and reflecting light. There is no colored glass in the Karascope, only the spectral colors of light itself.
Ordinary white light which vibrates in all directions is polarized along one plane when it passes through the base of the tube. The light then enters clear colorless pieces of birefringent material and is reorganized by the eyepiece to produce the startling colors that you see. The patterns, unlike those in a kaleidoscope, are asymmetrical.
Hold the Karascope toward the light, rotate the base, and the image changes. A twist of the eyepiece alters the colors of the image and causes the pattern to swirl to or from the eye. The spectrum also shifts as the Karascope is pointed toward different light sources."
Outer tube has some fading otherwise good condition.