The energy we can’t see within nonphysical space is the foundation or soup that holds 3D in linear physicality.
The 8-balls of this bifurcating Y are infinite. The “dark matter” is quantum energy that passes through the membrane that separates one dimension from another. It’s a soup, not a wall. It passes into linearity – left, right, up, down vs everywhere now.
There is a similar sketch, in the first batch of awakening sketches, that talks about puzzle.