The color purple is unlike all others, in a physical sense - https://www.zmescience.com/science/color-purple-non-spectral-feature/

What color is a mirror? It’s not a trick question ( white and green ) - https://www.zmescience.com/science/physics/what-color-is-a-mirror-its-not-a-trick-question/

why is snow white - https://www.zmescience.com/science/why-is-snow-white/

The Ames Room: The optical illusion that will make you doubt your eyes - https://www.zmescience.com/other/feature-post/optical-illusion-ames-room/