I wonder whether comparing the strings in string theory to violin strings isn't carrying analogy too far. Violin strings are never loops.
I think it is misleading to speak of 10 (or 11)dimensions. Call them variables, three of space, one of time, and 6 (or 7) of something else (singular or plural?). Are the six (or 7) all equivalent to each other the way the three space ones are? Calling them coiled-up space doesn't seem very satisfactory.
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In an interview in Discocer magazine, Shing-Tung Yau referred to the six dimensions of "compact space" and said they amount to pure structure.
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