File:Glasses lying on laptop touchpad and erroneously producing strange effect on scrren.webm

English: CAUTION: People who are sensitive for optical impressions with fast changing brightness should not look at this at all, as the blinking frequency may cause unwanted effects in their brain.

A pair of reading glasses is lying on a laptop computer, at random in a position so that their (small) weight activates the touchpad. As a result, a paragraph of the Wikipedia article on the screen is - in a fast but random sequence - highlighted and dis-highlighted. The average time until the next blue-white-period starts is 1/6.5 seconds, meaning the highlighted section blinks with 6.5 Hz.

The situation was not intended but appeared suddenly on the photographer's computer, who first thought that his laptop had a grave error - until understanding what was happening.

For programmers, engineers, physicists etc.: This effect seems to be an interesting example of interaction between the weight force permanently exerted by an object on a "switch" (the touchpad) and a computer system, while the resulting oscillation frequency on the screen is probably influenced by both the scan rate of the touchpad and the highlighting procedure in Microsoft Windows - just a first guess. If someone has any ideas, questions etc. theron, you are invited to post them on my talk page.