There is something about mono-wheels that I find irresistible. This is despite two engineering degrees and years of professional experience that screams, “Not Practical!”, “It would have a giant turning radius!”, “There are reasons why unicycles are only seen at circuses!”, among other things. I think my appreciation is because the mono-wheel is the distillation of a vehicle down to the fewest components: a wheel, a seat, and an engine. Daniel Church has provided an excellent mono-wheel. The wheel is constructed from the new roller-coaster track and detailed with light grey and black Nexo shield tiles. The boiler behind the driver is well constructed as is the piston assembly. The best part by far is that Daniel motorized the whole thing, the mono-wheel in motion with the chain drive running and the piston pumping really sells the steampunk design.