Real can be transposed as meaning
occupied space.
1} An
occupied space surface as represented by curved line ( of events is inherently two aspects that have real affects on energy ---ex photons-- the interact with the surface i.e. shape convex-concave{ ergo positioning } affect reality.
.......Shape/pattern is an inherent complement to
occupied space. ...
Occupied space cannot exist with out having a shape/pattern.
2} Symbol comes in various degrees and is really just language irrespective or written or numerical all language/symbology stems from access to
metaphysical-1, mind/intellect/concepts
3} Imaginary is
metaphysiscal-1, mind/intellect/concepts and humans only has access to
metaphysical-1, mind/intellect/concepts via experience{
occupied space }.
...Images are based on EMradiation{
occupied space } that enters our eyes{
occupied space } and procesed by brain{
occupied space }.
Occupied space is complemented by
metaphysical-1, mind/intellect/concepts and that includes geometry of shape/pattern and the metaphysical-1, mind/intellect/concepts are not space.
The first subcatagory of Space is as follows and Ive made clear in Cosmic Outline:
1} macro-infinite non-occupied space,
2}
occupied space aka God/Universe/
Uni-
V-
erse
None have ever invalidated the above and none ever will.
The tetrahedron \Y/ is its own dual. However, its position as dual is relative to other tetrahedron. Again all is relative{ related }.
This is best observed as two equal sized dual tetrahedra that define 8 corners of a cube and 12 surface diagonals stabilizing cube.
See this
link.
http://www.rwgrayprojects.com/synerg...igs/f6200.html
One shape is its own dual. Ergo duality exist via relativity of position/location.