Optical illusion shows 'something cool' once you stare at centre for 15 seconds
A new optical illusion has been shared on TikTok and it promises to show "something really cool" if you stare at it for a few ...
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This Victorian ghost book exposed spiritualist frauds with cool optical illusions
In 1864, a peculiar book called "Spectropia" offered Victorian readers a scientific way to summon ghosts. As the Smithsonian reports, author J.H. Brown created this "toy book" to combat what he called ...