Human perception of the movement of now, the flow of time, seems to be determined by the number of milliseconds it takes to send a signal from the eye or ear or fingertip to the brain and to record and notice and remember. For humans, that’s a few tenths of a second; for a fly, a few thousandths of a second. That’s why it is hard for a human to catch a fly. To a fly, your threatening hand approaches in slow motion—just as in Clockstoppers.
