Why these circles appears to be a spiral?
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Tilt illusion is presented in a linear fashion. If lines are replaced with concentric circles, spiral illusion appears.
End of conversation
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What are you talking about? These ARE spirals. I can prove it by just getting my pen, and tracing along....hey, wait a minute...
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Now this one is impressive
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What's underlying this? Got a suspicion it's something to do with how the black white raster seems distorted in a weird way, assumably "as if" a spiral was on it. But the difficulty to 'not see' a spiral is impressive - really can only verify by tracing out the circles by finger.
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OMG I had to work so hard to verify Good one!
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Focusing eyesight at place where the red cross is drawn, causes the picture edges (esp. the far left side) to look somewhat blurred. Not sure exactly why is so.pic.twitter.com/keFMnS2tIW
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