I think the title is the most proper question that could come up in my mind, as for an example - take a look at 2014 ESC postcards:
or this:
Thanks in advance!
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These use the shape, color, and arrangement of familiar objects to simulate the appearance of something unrelated. Would you consider this kind of "food art" in the same category: https://allthatsinteresting.com/food-art? – fixer1234 Nov 18 '19 at 09:08
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@fixer1234, I would probably say so, yeah. – Remarken Nov 26 '19 at 19:41
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Optical illusion
According to Wikipedia, this is
an illusion caused by the visual system and characterized by a visual percept that arguably appears to differ from reality.
In the first two photographs (making it '(optical) illusion photography'), this 'visual percept' is a flag. Here the 'illusion' is caused by the (careful) positioning of objects in alignment relative to the point of view.
Another term often used is for this is 'forced perspective', which is a type of optical illusion.
Though the illusion is not as monumental as the word suggests, it functions basically the same as works like this one, the Triumph of the Name of Jesus by Giovanni Battista Gaulli:
This example is another sub-category of those optical illusions, referred to as trompe l'œil (from French, meaning 'fooling the eye'), a term which is almost exclusively to paintings. It is often used in conjunction with architectural forced perspective.
Our perception tricks us into seeing more than the sum of the parts (like depth, light, &c.).
The construction of (linear) perspective is also based on this principle.
Joachim
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3I can't really figure out what the second set of photographs is about. If it is another optical illusion, I don't see it - if not, I think it should be posted as a separate question. – Joachim Nov 18 '19 at 01:10