So I was driving home on the interestate yesterday and the sun was sorta overhead, but a bit ahead, and it was a bit to the left. There were a bunch of leaveless skinny trees in the center of the interstate, which meant that I kept going from being in sun on my eyes to being in shade. Back and forth.

I am certain it caused me to view everything in front of me as flashes of red. It may have also done blue, but the contrast of the blue sky and winter earthtone colors was not as noticable as the contrast with red.