Because sometimes they turn with a frequency that sometimes slightly mismatches the “frequency” that we look… i guess there was a video on youtube. When you look at the rotating circle with, it speeds up to 1 RPM, 2 RPMs, and so on, and, when it seems like it’s turning backward, it means that your eyes miss some of it’s movement, en only see like 99%, but every single time… and it looks like turning opposite direction…
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