your eyes are imposing the images over one another in your brain. Its combining the features of each creating an uncanny combination. If you use the same image on both sides, the illusion goes away.
Crazy.
Eyes, as living organs, are fascinating. Their relationship with the brain and though processing centers is deeply interesting, but its out of my field of expertise and remain a huge mystery to me.
Yes, amazing and amazing how little we know about it all.
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