You stare the some shape of 0xFF0030 and then close yores eyes and the inverted color appears.

So, the cover of R.E.M.'s 1988 record titled Green, which is actually orange. You're supposed to stare at it, then close your eyes, and you see the album cover as it's intended to be viewed.

https://en.wikipedia.org/wiki/Green_(R.E.M._album)