Annals of cluelessness: Until fairly recently I did not know that CDs spun. I thought they stayed put and clever optics caused the laser beam to chase around them.

Reminds me of Tennyson's "ringing grooves of time". A footnote to "Locksley Hall" explains that he had recently taken his first train trip & had not noticed the rails. He was under the impression that the wheels ran in grooves.