I think it may be related to the eye over-compensating for seeing too much of one subject.
eg...Hold a red sheet of paper against a white background...Stare at it for about 20 seconds Take away red paper but keep looking at the white background. You should see the shape of the red paper only now it is green...the opposite colour to red.
If I am gazing along a straight road, the forward movement of the car at speed gives the effect that the road is rushing to meet me. After many km, when I stop the car and look down the road it appears that "the tape is being run backwards". Instead of rushing to meet me, the road is rushing away to the horizon. This lasts about a minute, then fades away like the red/green images.
I am surprised you have not been aware of this, Mark. Better get more driving in.
Last Edit: Nov 2, 2019 1:30:31 GMT by questa: No magic mushrooms were harmed in the making of this post.
Travel! Set out and head for pastures new[br] Life tastes the richer when you’ve road worn feet.[br]Ibn Battuta[br]
At the moment it is two to one against for this phenomenon, so it could be we need a bigger sample, but currently "I'm surprised you are aware of this, better do less driving." Maybe it's from when you were dropped on your head as a baby.