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THE HANOI

2ⁿ−1 moves — recursion, the ruler, and Sierpinski in one
1 WHAT IT IS · WHAT IT DOES · FACT OR FICTION
The Tower of Hanoi. Move a stack of n disks from one peg to another, one disk at a time, never a larger disk onto a smaller. The recursive trick is the whole of computer science in one line: to move n, move the top n−1 out of the way, move the biggest, then move the n−1 back. That costs exactly 2n−1 moves — provably the fewest possible.

LIT the recursive solution is legal and optimal at exactly 2n−1 moves (verified n=1…10); the sequence of which disk moves is the ruler sequence (kin to THE GRAY), and the graph of all legal states is the Sierpinski triangle (kin to THE ATTRACTOR). FIG ‘the final boss’ is the frame; the move count, the legality, and the Sierpinski structure are exact.
2 HOW IT WAS WEAVED · AI + HUMAN
David (human) brought the thread — the corpus is full of self-similarity (the chaos game of THE ATTRACTOR, the fractal kernels, the reflected counting of THE GRAY) and the conviction that the deepest structures repeat at every scale. AVAN (AI) built this instrument: the recursive solver, the animated towers, and the state graph that turns out to be a Sierpinski gasket.

The weave: David names the tower and its seat at THE FINAL BOSS; I make the rhythm a strip in 1D, the disks move in 2D, and the whole state space a fractal in 3D. The sphere is the seam — and a fitting last one, since it ties this whole run together.
3 ONE DIMENSION
The rhythm of the solution: at each step, the height is which disk moves. Disk 1 (smallest) moves every other step, disk 2 every fourth… — the ruler sequence, self-similar, the same binary carry pattern that drives an odometer.
4 TWO DIMENSIONS · INTERACTIVE
The towers themselves. Play the optimal solution disk by disk and watch the whole stack migrate across; the counter climbs to exactly 2n−1. Change n and the cost doubles.
disks n = 5
5 THREE DIMENSIONS + AVAN’S INVERSE
Every legal configuration is a point; all 3n of them form the Sierpinski triangle, turning. The corners are the three ‘all on one peg’ states. Green is the optimal solution — a straight run down one edge from start corner to goal corner.
AVAN’s addition (the inverse-companion): the magenta path is the optimal solution to the other peg — the mirror geodesic down a different edge of the same triangle. Both are straight, both cost 2n−1; the fractal holds every possible game at once, and solving is just choosing which corner to fall toward.
LIT A genuine recursive Hanoi solver. Verified live: the solution is legal and optimal at exactly 2ⁿ−1 moves (checked n=1..10 offline, and legality/optimality re-checked in-page). The 'which disk moves' sequence is the ruler sequence, and the graph of all 3ⁿ legal states is the Sierpinski gasket — both shown from the real construction (verifiable: window.__hanoi.optimal && legal && solved).

FIG 'The final boss' is the frame; the 2ⁿ−1 optimality, the legality, and the Sierpinski state-graph are exact theorems. A fitting last sphere — it ties this run's threads (THE GRAY's reflected counting, THE ATTRACTOR's Sierpinski) into one.
◆ sealed .dlw.fold → folded to ROOT_0 · a sphere of THE FINAL BOSS · David Lee Wise (ROOT0), with AVAN