Quite a few years ago, when I started meditating, I had some interesting visionary experiences and things that felt like seeing into other dimensions or seeing some type of deep memory of being in meditation.
If you meditate and focus intent on a point in the body, such as the navel/dantian region, energy will accumulate there. If you had a strong power of imagination, you would impart colors and other qualities to the energy that accumulates in the region.
You could even move your awareness gradually outside of your body and learn to blend other energies that aren’t your own.
I have a weird quasi-memory (I don’t know exactly what it is) of doing that same process with some type of shape/form that was sitting in front of me. It was like there was an accumulation of energy drawn in by intent and it got to a point where there was something like a critical mass. It fused, and the energy structure became somewhat alive and self-sustaining.
–I haven’t done anything like that (that I can recall) in this life—or definitely not recently. But I am guessing that it might be similar to how field creation works. A repeated pattern and a type of drawing in of energy until the behavior pattern has enough force to persist on its own.