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The Double is a strange fascination of many, and PR's referencing the duplicitous 4th dimension, time, and spatial slippage everpresent, and our holographic space/time proves gravity an illusion? positing perhaps that the double is less as a conceptual predicament than a material one: pieces of clean metal in a vacuum will auto-weld together, atomically unable to differentiate their objecthood and so confused become one. Mathematical quandries of whether or not "2" exists, or "1" for that matter, is saying 2 silicon atoms true, or are all silicon atoms unique clouds that aren't mathematical abstractions stripping unique properties, particularly when today and tomorrow don't particularly exist. Tricky questions, sure.