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84 votes
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Is this popular optical illusion made of a grey-scale image with coloured lines?

As Øyvind Kolås, the original creator of the ilusion noted: The visual experiment that went along with my previous post went viral, the one that went viral was an already lossily compressed JPEG ...
richardb's user avatar
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48 votes

Is this popular optical illusion made of a grey-scale image with coloured lines?

Yes. this is the so-called Munker illusion, similar of White's illusion. So named after Munker H (1970): "Farbige Gitter, Abbildung auf der Netzhaut und übertragungstheoretische Beschreibung der ...
LangLаngС's user avatar
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34 votes

Is this popular optical illusion made of a grey-scale image with coloured lines?

The human visual system (i.e. eye + brain) processes chroma (e.g red vs green) differently to luminance (i.e. light vs dark colours). In particular the brain derives fine detail and texture from ...
Paul Johnson's user avatar
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9 votes
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Was a mirage involved in the Titanic's sinking?

It's quite plausible. The 'fog' which surrounded the iceberg may have been a mirage caused by super-refraction. The British Government's 1992 MAIB report posits the presence of super-refraction as a ...
A E's user avatar
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3 votes
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Is this an authentic image of a UFO sighting in Canary Islands (1976)?

This Spanish language article contains more information about the missile launches, including this image of entries in a database of launches (see poseidon launches only here) compiled by ...
Harabeck's user avatar
  • 670

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