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Apparently, in string theory, strings that oscillate to the left behave differently from strings that oscillate to the right. But how can you tell if what appears to be a right-handed string isn't really a left-handed string upside-down? And what about strings that are on their side?
Osscilation clockwise round a closed loop is different from oscillation anticlockwise its a bit like spin up and spin down in an electron.
Remember in quantum theory you gave to measure an object before you know what it is and in measuring "spin" you change it.