Researchers made a porphyrin-like ring that can do something its paper analogue can't: the new molecule can switch back and forth between the one-sided Möbius topology and a "normal" two-sided state (Hückel topology) -- without breaking the ring.
The first time, it's a KLUDGE! The second, a trick. Later, it's a well-established technique! -- Mike Broido, Intermetrics