If a point has no dimension, a circle is 2 dimensional and a sphere 3d - isnt the next dimension normally time in which case what would the next one in the sequence be?
Just an afterthought, and sorry for confusing things, but taking the sequence in the opposite direction, we wouldn't go from a sphere to a circle, then to something unmeasurable. So maybe the 'point' is in fact an infinitesimally small dot, and the dimensions would then be those of an infinitesimally small disc. What do they mean by 'point'?
Four-dimensional hypersphere. Defined as all points a distance r away from a center point, in four dimensions. It is the tetraspace analog of the circle in planespace and the sphere in realmspace. Its solid version is the gongyl.