Quote -
If you are interested, take a look at this fascinating -certainly in the context of this discussion- article from a few years ago, the "White's Illusion" that plagues the human brain can also occur in "any system that tries to emulate human vision." (quote from the article, emphasis mine)

So what does it say about me that "White's Illusion" looks like two equally grey boxes to me. I have to really do some concentrating to get the one on the left to look darker.