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The Moon optical illusion

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#1 L. Regira

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Posted 01 April 2020 - 11:23 PM

I was viewing the Straight Wall in my binoviewer when I noticed the craters south in the lunar highlands towards Clavius morophed from depressions into appearing like raised bumps.  I had seen these illusions in books before but not live at the telescope. It was much harder to see details and my mind was blown.laugh.gif 

Lawrence


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#2 TOMDEY

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Posted 02 April 2020 - 01:28 AM

Yep! it is indeed ambiguous; geometrically, either interpretation is equally-valid from the data... depends on where our subconscious (needs to) assume from what direction the light is coming. Myriad such others. Like a spinning exponential spiral being mathematically identical to entering or leaving a helical screw. Or a slip/sliding accelerating airplane confounding an inexperienced pilot's sense of up and down... too often resulting in tragedy. Thankfully, Buzz Aldrin was supremely experienced!  Tom

 

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#3 GUS.K

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Posted 02 April 2020 - 03:25 AM

I see this illusion quite often when viewing the moon, most notably when I'm tired, I usually look away for a few seconds and it reverts back to normal.




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