Are there really three dimensions, or is ‘dimension’ only a concept that helps us do the math?<br><br>Why?  Because there is no such thing as a two dimensional object. If you shrink one dimension of an object to zero, the object does not exist. So, in a sense, each set of two dimensions is entirely dependent upon the other one. They are not separate, distinct things.<br><br>We hear so much talk about ‘extra dimensions’. I question whether there are any ‘dimensions’ other than in the math that we invent.<br><br>Three dimensions may be the best way we have at present to describe space, but a better description is out there somewhere.