This multistable perception tricks your brain depending from which side is viewed. From right to left is a persons nose, where as from left to right is another shape. A known example of multistable perception is the Rubin vase which we all have seen.
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Didn't get the multistable reference, but really appreciated the portrait trace as seen from left to right. Like the fingernail crescent moon recently in the night sky, but assuming human intimations. A moment from coming or going.