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It is a three-dimensional figure that can be formed by taking a long rectangle of paper and twisting it once before joining its ends together.
The result is a figure which subverts our normal (Euclidean) way of representing [[space]], for it seems to have two sides but in fact has only one.
Locally, at any one point, two sides can be clearly distinguished, but when the whole strip is traversed it becomes clear that they are in fact continuous.
It is only because the two sides are continuous that it is possivle to cross over from inside to outside.
Yet, when one passes a finger round the surface of the [[moebius strip]], it is impossible to say at which precise poitn one has crossed over from inside to outside(or vice versa).
==See Also==
