When I was eleven (1965), I was watching a national holiday parade in some mid-west town...Lincoln, Nebraska perhaps. I stood at the curb watching various tanks, personnel carriers and what not flow down the street in front of me. A hot day...looking down at the pavement at my feet, I could see the asphalt move. Too spooky to mention to anyone in my family around me -- did not anyone else notice?
Eventually discovered that when presented with a constantly flowing image, my brain wants to continue that flow when looking away from the original movement, causing an otherwise static image (reality?) to move. Sitting on a tailgate of a pickup driving out of Kings Canyon (1973), watching the landscape recede, the driver pulled out at a wide spot and stopped completely. Both my friend and I on the tailgate started to freak. To us, our brains told us that since the landscape was no longer receding, we must be moving in the opposite direction, and it took us that second or two to be sure the truck was not actually rolling backwards over the cliff as our brains were trying to tell us it was.
Anyone with experience with courts know the unreliability of an eye witness.