[Avitas]

This trick has an interesting artifact.

When I came back to HN, I noticed that my mind made my vision appear actively "wavy." In other words, I could see some slight movement of waves on the horizontally drawn elements currently displayed -- the top orange bar that says [Y]Hacker News [...] had the appearance of fluctuating with low frequency waves.

[knutae]

Interesting, indeed. I didn't get that, but it is probably similar to the effect caused by videos like this: https://www.youtube.com/watch?v=tVgOLWVYytM

[asymmetric]

I got this too!