>> More fully: Some formulations of string theory suggest that the
>> universe has as many as 11 spatial dimensions. The obvious question is
>> then "so why can't I see any of them?", and the only answer anybody
>> has come up with is "well, maybe they're really tiny..."
>
> That one is easy. Simply because our eyes can only see in 2d. We can
> perceive 3d images because of the stereoscopic effect of having 2 eyes.

That doesn't explain why visible objects around us only move in 3 
dimensions. If there were more dimensions and we should somehow only 
"see" 3 of them, we should see objects constantly zipping into and out 
of the 3D slice we can perceive.

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