The 10th dimension is the first dimension, in a higher octave. You don't climb to a tenth floor. You come back to the first floor, at a higher pitch.
The model is called harmonic recursion, and it has three parts: a code, a structure, and a mechanism. The code is nine numbers, and the first evidence is arithmetic. The structure is the octave that those numbers build. The mechanism is what happens at ten — the crossing where the same substance changes phase, in place.
This film takes you through all three. From the checksum that's been running for a thousand years, through the spiral and the ladder-in-the-ladder, to the boiling point where two states are true at once — and the center point that holds them.
The code is the octave. And the tenth is the first, in a higher octave. And you're the center of it.