If my guitar went through the Star Trek transporter beam and had all its molecules disassembled into energy and was reassembled via the inverse process from different energy strings, is it still that guitar or is it a duplicate?
If you cover your eyes and the guitar disappears and then you uncover them and it reappears, is it the same guitar?
Thats not the same as the Star Trek thing though, right? The guitar never stops existing, whereas with the star trek thing there is either a moment where it does not exist or a moment where it exists in two places at once.