Now that we have multiple cool basic light effects it is time to address one of the more annoying issues of pulse width modulated displays. They always seem to flicker. This is because lots of them have cycle rates well below 100 Hz.
At first glance it seems that the human eye can not resolve such frequencies. Indeed this is true for fixed points on the retina. However for moving objects the retinal image will also move. Thus if the cycle rate is to low the image will not appear as one line but as a series of dots. In order to observe this effect run one of the patterns of the previous experiment and move the shield in front of your eyes.
This effect is also visible if the shield is stationary and you look to the left of the shield and then suddenly to the right.
The same is visible with lots of car tail lights. I find this extraordinary annoying. So if anyone of you has a chance to fix this: read on and learn how.