The Honda U3-X is a self-balancing motorized unicycle is a new "personal mobility" technology just announced in Tokyo. It isn't fast - less than four miles per hour - but you can't match its gliding motion. In any direction.
(Honda U3-X like Heinlein's tumblebug)
Science fiction fans may see this as being pretty close to Robert Heinlein's tumblebug from his 1940 novella The Roads Must Roll:
Gaines and Harvey mounted tumblebugs, and kept abreast of the Cadet Captain, some twenty-five yards behind the leading wave. It had been a long time since the Chief Engineer had ridden one of these silly-looking little vehicles, and he felt awkward. A tumblebug does not give a man dignity, since it is about the size and shape of a kitchen stool, gyro-stabilized on a single wheel.
(Read more about (and see a picture of) Heinlein's tumblebug)
Tesla Model S Declared Car Of The Year By Motor Trend
'They can therefore roam over the roads of the entire hemisphere [combining] the sensations of coasting with the interest of seeing the country well.'- John Jacob Astor IV, 1894.
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Sky City's 220 Stories Are Go
'It rested among green parklands and... stood in total isolation, a glittering block of whites and flashing windows dotted with colors.'
Robo-Raven Flapping Wing Robot Bird
'When he had first built them, they had been crude indeed, flying mechanisms with little more than a reflex-response unit.'