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Posted on 28/10/19 10:47:47 AM |
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tooquilos
Wizard of Oz Posts: 2898 Reply  |
An optical illusion
David, I saw this image the other day and I thought you may like to add it to you optical illusions folder. My first thought was there is a huge gaping hole at the top of the building but looking at it again I realised we were looking inside the building and the huge gaping hole is part of a dome. The actual building is called Church of the Holy Redeemer of Ani in Turkey https://www.wmf.org/project/church-holy-redeemer  _________________ Dorothy: Toto, I've a feeling we're not in Kansas anymore |
Posted on 28/10/19 11:05:50 AM |
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DavidMac
Director of Photoshop Posts: 5675 Reply  |
Re: An optical illusion
Interesting. The more you cover the bottom the more compelling the inversion. It depends on this straight on symmetrical angle. Most illusions depend on a unique viewpoint to work. Thank you for this. It's always interesting when illusions emerge by chance like this. Added to the archive. Thank you.  _________________ The subtlety and conviction of any Photoshop effect is invariably inversely proportional to the number of knobs on it ....... |
Posted on 29/10/19 3:29:22 PM |
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GKB
Magical Montagist Posts: 4002 Reply  |
Re: An optical illusion
I thought I would add this optical illusion: how is it possible for the spirals to be moving both up and down? http://vimeo.com/369583064 _________________ If at first you don't succeed then skydiving is not for you. |
Posted on 29/10/19 5:45:52 PM |
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DavidMac
Director of Photoshop Posts: 5675 Reply |
Re: An optical illusion
I haven't had time to really analyse this but, off the top of my head, the two cylinders are left and right hand 'thread'. _________________ The subtlety and conviction of any Photoshop effect is invariably inversely proportional to the number of knobs on it ....... |
Posted on 30/10/19 4:16:18 PM |
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GKB
Magical Montagist Posts: 4002 Reply |
Re: An optical illusion
... and this one. http://vimeo.com/369846056  _________________  |
Posted on 30/10/19 10:04:09 PM |
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DavidMac
Director of Photoshop Posts: 5675 Reply |
Re: An optical illusion
Now that is much more interesting!
Again off the top of my head, without proper research, this looks to be a circular variant of the impossible (Penrose) triangle. This triangular construction is interestingly (if you find such abstruse matters interesting  ) mathematically equivalent to a möbius strip with a triple twist - to which your figure bears more than a passing resemblance.
But, of course, you all knew that already ......... 
_________________ The subtlety and conviction of any Photoshop effect is invariably inversely proportional to the number of knobs on it ....... |
Posted on 30/10/19 10:07:01 PM |
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DavidMac
Director of Photoshop Posts: 5675 Reply |
Re: An optical illusion
Ooops double post removed. _________________ The subtlety and conviction of any Photoshop effect is invariably inversely proportional to the number of knobs on it ....... |
Posted on 30/10/19 10:13:21 PM |
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GKB
Magical Montagist Posts: 4002 Reply |
Re: An optical illusion
That description pretty well sums it up. Picture a long Toblerone twisted lengthwise 360 degrees and then curved around on itself. Then just rotate the Toblerone. _________________ If at first you don't succeed then skydiving is not for you. |
Posted on 31/10/19 10:58:22 AM |
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DavidMac
Director of Photoshop Posts: 5675 Reply |
Re: An optical illusion
What a truly graphic and excellent description. You are liable to get quoted if am pontificating upon the subject in the future. I wish I had thought of that. Which puts me in mind of the rivalry between Whistler and Oscar Wilde who once commented "I wish I had said that". To which Whistler replied "You will, Oscar. You will!". _________________ The subtlety and conviction of any Photoshop effect is invariably inversely proportional to the number of knobs on it ....... |
Posted on 31/10/19 10:59:19 AM |
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GKB
Magical Montagist Posts: 4002 Reply |
Re: An optical illusion
Even better than a verbal description 
http://vimeo.com/370035745 
_________________ If at first you don't succeed then skydiving is not for you. |