Diametral Inclinations

Each Body plane contains of two diagonals.
These diagonals are two dimensional. Each diametral direction is placed between two directions of the dimensional cross and two directions of the diagonal cross.

Two dimensional circles appear, when one connects the four corners of a plane. Either frontal, horizontal or sagittal.

Passing through the centre of a plane, while connecting the peripheral corners of a plane, one creates two-dimensional figure eights.