Strobe dots

There is a LED enclosed at the left which flickers at the turntable's platter speed (eg. 33 1/3 RPM), which then results in one of the lines of dots appearing to be stationary.

 

In the case of 33 1/3 RPM, the largest dots appear not to be moving. Speeding up the turntable eventually causes the higher dots to stay, and vice versa.

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Taken on October 26, 2005