Interpretation is reality.
If you concentrate on looking only at one, you can notice they're the same picture, but you can also actually feel your mind trying to pull against your vision. It's a strange feeling.
There's lots of examples of the mind filling in visual details that aren't really there. Someone who knows more about this subject than I do says it's an artifact of the necessity to cut down on the sensory information we receive, so as to only receive the most relevant information. (The survival benefits are obvious.) Things like, if there are three dots aligned as though they were 3 of the 4 points of a square, the mind "paints in" the fourth and final dot to complete the shape.
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