Related Clues:
- Solid figure - light separator
- Ring shaped like doughnut with hole
- Shape used to disperse light beams
- Solid figure
- Solid that resolves light into separate colours
- Disperser or reflector of light
- Shape of doughnut
- Transparent solid for dispersing light
- Solid with only square faces
- Body with six equal square faces
- Glass triangle that separates white light into the colour spectrum
- Optics prop
- Light shower?
- Freezer cooler
- Rubik's --