Let x = the angle between dimensions. A cube is described in 3 dimensions, knowing x = 90 degrees. The same cube can be described in 7 dimensions when x = 45 degrees. The 2nd decription is more complex but it's still a cube. If an object can be described by any number of higher dimensions and the matching value of x then our universe is only 3 dimensional if x = 90 degrees. Who proved x can only ever equal 90 degrees? or have we presumed we live in a 3D universe simply because x = 90 degrees is mathematically and geometrically convienient?