TESLA, THE VORTEX, AND THE MIRROR Start with the familiar 3-6-9 vortex .... 1 → 2 → 4 → 8 → 7 → 5 → 1 That sequence is simply repeated doubling mod 9. But halfway around the cycle, every state lands on its mirror: 1 ↔ 8 2 ↔ 7 4 ↔ 5 So the vortex wheel is an exact