This is a great illusion!

Amazing indeed!
 
That is quite something and I think the effect is enhanced because of the 'relief' red painted areas to add to the illusion that the window frame has depth.

The mind is indeed a strange thing!
 
Reminds me of an old acquaintance - Bill and Ben's friend...

Anyone else fallen into the centre of an old Black Sabbath album while it's playing?
 
We learnt a lot of these things in the sixth form, more than fifty years ago!

That was because our headmaster had a bee in his bonnet about "psychology being essential for the modern world". Still it was only one period a week and, if you developed the right approach, you could could get a start on some important homework, while perpetrating the optical illusion that you were making copious notes on this important subject! :naughty:
 
Pretty cool that, I was determined to 'un-see' it but, brain said 'nope!' :D
 
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