Fixed gear proponents enthuse about the simplicity of fixed gear bikes -- because there are fewer moving parts, the bikes are cheaper, simpler to maintain, and bulletproof.
In reality, though, we ride the bikes because they're so cool. Now that everybody has gotten into fixed gear hipness, though, they're not as hip. They're as ubiquitous as dog droppings on Paris sidewalks. For the ultimate in simplicity, can I propose the Nimbus Ultimate Wheel unicycle? This is literally just a wheel with two pedals. No gears, no brakes, no extra wheel, no pesky steering tube, no bottom bracket or cranks, no chain or chainring, no rear cog, not even a seat. Its compact size even makes it transit friendly for multimodal use! And because it's so difficult to ride -- even moreso than a standard unicycle -- nobody but the truly hip will ever ride this wheel.
A unicycle is pretty hard to get the hang of riding, even with the fork connecting at the center of the wheel. This looks like it would be even harder to ride because the pressure on the pedal on the downstroke would want to turn the wheel in the same direction. I could be wrong. Either way, I’d love to TRY and ride a prototype.