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Here is a fabulous optical illusion that you can download for free, print out and make yourself!
These little paper dragons are an example of what is called the 'hollow face illusion.' The head or face of the dragon is folded the opposite way you would expect - it is hollow or concave. However, our brains expect faces to stick out, to be convex. And so our brains 'flip' the face of the dragon, and we see it as being convex.
But... when we move, or if we move the dragon, the perspective of the face does not behave in the way our brain expects. And instead of seeing the face as it really is, the brain comes up with an alternative reality - it thinks the face is moving in a way that it is not!
We have got three PDF files, for a blue dragon, a green dragon or a red dragon. Just download the one(s) you want, and print the PDF out onto a sheet of A4 paper. 80gsm or 100gsm. Note that page sizes in the UK are not always the same in other countries, so look for the print option 'fit to page' or 'scale to fit'. Then cut out the dragon, fold it as instructed, and assemble it. A paper glue is best, although you can use sticky tape. Then stand by to be amazed. And then amaze all your friends too!
It sometimes helps if you close one eye when viewing the dragon...
BLUE DRAGON
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GREEN DRAGON
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RED DRAGON
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