Think of spirit/mind/physical/emotional as spectrums of the same energy. Imagine the information having harmonics along this spectrum.
What I mean is the note C on the piano repeats as it goes up the scale. If it keeps going ti enters light, and beyond yet there is a strong tie between all the 'c's.
Mind, body and spirit are informationally tied in such a manner.
Another way to see this is like how water can change its consistency to ice or vapor. Same water..different "form."
If you look at energy as flowing information you start to get how this works. Yes in a sense it is illusion but that is just an operative word for the code of this experiencial reality.
An area of interest for you may be sacred geometry. You begin to see some of the conscious constructs in the form of building blocks that shape reality. The key though is these too are collectively imagined and can morph along with our thoughts.