Stare at the red dot in the centre of this image for ten seconds.
(Wait ten seconds)
If the illusion worked you should have seen the monochrome cityscape be tinged with pastel colours.
According to Gizmodo’s Sploid, which publicised the image, by focusing on the dot you are effectively burning, temporarily, your retina with the colours in the previous frame.
When the image becomes black and white, the halo of the colours still appears to linger.
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