Shepard Tone

What: Okay you got me! Yes, this is not an optical toy, but an auditory one&hellip; the Shepard tone was named by/after scientist (and optical illusion lover) Roger Shepard in 1964, in this paper [1], Circularity in Judgments of Relative Pitch. Honestly worth checking out, as the paper instantly references the Penrose stairs [2], as a source of inspiration. So what are we experiencing here? Well…