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[puddingcat]

xambrius has just made me realise something.

One theory of the universe is that it has 10 dimensions; 3 along each visible axis, and the tenth being time. How appropriate that we're on the Tenth Doctor :)

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[nmg.livejournal.com]

In string theory, and its offspring M-theory, it is assumed that there are as many as eleven dimensions, but that some of these are 'rolled up' smaller than the Planck length and cannot be observed.

A common analogy for this is to consider a piece of garden hose. From a distance, it appears to have only a single dimension, its length. Close up, there is another closed dimension, namely its circumference.