This one is my favorite. 😁

Hahaha well I did it when I was still thinking about using FFT and having multiple frequencies 😅

This is beautiful! I do get distracted by the fact the connecting line changes length. What would it look like if that line itself stayed at its maximum length while the (left) dot moved back and forth along it?

Here I modified the viz with your suggestion right below :)

That's very pretty! Not what I meant, mind you, because the result is not a sine wave, but still very pretty.