I hold up a piece of paper in front of you.
Question: you see the front of the paper but does the back not exist because you do not see it?
I flip the paper.
Question: does the back (now front) exist but the front (now back) cease to exist?
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I hold up a piece of paper in front of you.
Question: you see the front of the paper but does the back not exist because you do not see it?
I flip the paper.
Question: does the back (now front) exist but the front (now back) cease to exist?