Abstract: According to an embodiment of the disclosure, a method of moving an item in a torus-like infinity pattern. The method includes moving the item poloidally along a path with reference to a torus grid at least partially moving the item toroidally along the path with reference to the torus grid such that when the item substantially moves around a revolution around the torus grid when viewed from a cross section cut across the poloidal direction of movement, the item also moves poloidally.