John Carmack: Color saturation in a reflection

I noticed a strange reflection from a screen onto my iPad surface, where icon colors appeared more saturated in the reflection, which didn't make sense — the reflection should be wavelength independent. It showed up in a photo, so it wasn't an illusion. I was puzzled for a bit. pic.twitter.com/PYBjfiJyUr

— John Carmack (@ID_AA_Carmack) July 26, 2020