"When you look at the picture below, do you see straight or curved lines? That's the debate triggered by the viral optical illusion that's now raging on social media. The image is an eight-by-eight grid of grey squares separated by narrow green lines - almost like a bird's-eye view of a city. Bizarrely, when we look at the image, the green lines appear to be constantly moving and curling in all directions."
"He pointed out that it only seems to affect the 'peripheral vision' - what we see beyond our direct line of sight, or out of the corner of our eye. 'The bits I'm looking straight at have straight lines, but the lines further from where I'm directly fixated go all curved,' Dr Troscianko told the Daily Mail. 'Hidden in those little grey squares are actually a series of lines/stripes at different angles,' Dr Troscianko said."
"The answer to why this illusion works appears to be hidden inside the grey squares, of which there are 64 in total. Looking closely inside the grey squares, we can see tiny grey shapes of various shades and sizes, like assortments of little pebbles. It is these little shapes that trick the brain into thinking the straight green lines are curved rather than straight, the academic suggested."
An eight-by-eight grid of grey squares separated by narrow green lines produces a striking visual illusion in which the green lines seem to move and curl. Focused foveal vision reveals the green lines as straight, while peripheral vision perceives curvature and motion. The grid contains 64 grey squares, each filled with tiny grey shapes and subtle angled stripes. Those small internal patterns become more apparent in peripheral vision and interact with the green separators, causing the brain to misinterpret straight lines as curved. The effect has provoked strong viewer reactions on social platforms.
Read at Mail Online
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