How many purple dots do you see in the image above? Are they all the same hue? This new optical illusion, developed by biomedical optics engineer Hinnerk Schulz-Hildebrandt, is more revealing than you ...
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Do you see blue or purple? Mind-boggling optical illusion divides the internet - as viewers struggle...
From colour-changing fire trucks to 'The Dress', many optical illusions have baffled the internet over the years. Now, a scientist from Harvard Medical School has discovered an illusion that might be ...
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Optical illusion test: Blue, purple or red-- what's the colour of this dot and the science behind it
Sometime back, Hinnerk Schulz‑Hildebrandt, a biomedical optics engineer at Harvard Medical School, stumbled on something odd while checking a flight map on his phone. As his eye followed the flight ...
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