Both stellarators and tokamaks appear as Möbius strips to confined charged particles. The key difference is that the toroidal transform is applied via induced

Both stellarators and tokamaks appear as Möbius strips to confined charged particles. The key difference is that the toroidal transform is applied via induced toroidal current in a tokamak whereas it's inherent in the magnetic field geometry of a stellarator. We're in the middle of the golden age of stellarator geometry research and optimization. It's a very interesting problem with large payoffs for modest investment.