While I agree with
Frozen North on the dimensional aspect somewhat, a correction is in order
The graph has 2 dimensions. Namely in the xy-plane.
Rotating a 2D object can result in a 3D object
if rotating means that you rotate in infinitely small increments and you 'copy' the object, and not 'move' it .
(or in otherwords: the resulting object is the collection of points that intersect some rotation of the original graph)