The shown image is in JPEG format, and there is quite a lot of color bleeding and smearing happening due to the JPEG compression artifacts, so even though the principle of the illusion may be sound (presumably relying on some kind of blurring/interpolation happening in our sensory apparatus), I think that the additional JPEG blurring makes this not the best way to illustrate the phenomenon.
Similarly, the Cola-can image above – claiming “There is no red” – is also in JPEG format, and zooming in shows some pixels that are clearly reddish in tint. Perhaps the original image contained no red, but after being subject to JPEG compression (maybe multiple times as people re-save the image again and again, each time degrading the image), probably the JPEG algorithm has smeared some red into the pixel colors.
It’s difficult to tell without any external AC units on the left building!
Edit: Actually, no, i think the left one is closer. It seems to have a definite right edge that’s obscuring the right building behind.
That’s pretty cool.
2
Who?
Two, so I’m crazy?
So funny thing. I got lasik in one eye. One eye sees far, and one close. For some reason I can see all six dots. Two of them blink out depending on what I’m focusing on, but if I focus on the middle two, I can see all six
And if I look through to middle distance rather than at a specific point, then I see there are 3 rows of four, so 12 dots 