I have noticed that when one looks at a stopwatch or timer, which counts up or down respectively. if you watch the time being displayed continuously on the clock it seems smooth and uniform. Though if you watch them change, then close your eyes and open them in the middle of the change, the first viewed number seems to stay up much much longer. So as an example, if we look at a digital watch, the seconds position increments at a given rate of one per second. If we watch this for a few increments we get a feeling for how long each increment should take. Now if we close our eyes with that feeling, and we open them between an increment it seems as if our perception for the time of that increment is actually much slower than it really is. I hope I explained this well enough. Its not the easiest to explain. Id like to know why this happens.