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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.

Too late to edit my post, but in fact, the boxes on the right should be darker, at least if you see how I do.

I made my own White's illusion. It's the same as in the article, only squeezed down. Squeezing the boxes down exaggerates the effect (see if they still look the same to you), and stretching them bigger will decrease the effect of the illusion.

The one on the right looks darker in your example but the example they showed actually had three vertical strips. I was looking at it wrong. I was comparing the grey strip on the far left to the one on the far right. The one in the middle does look lighter.