inventio, -onis f.
To be used for transportation, either of individuals, groups, or objects; insofar as the invention will reduce the friction of locomotion, speed and ease of travel will be increased — as, for instance, in the displacement of heavy objects from one point to another for the purpose of pleasure or profit. Also, productive elements: spinning, etc. Suggestive of inner workings, of gears and revolutions, which could, in turn, suggest new ways of looking at the world: mechanized, orderly. Yet also playful, for it could be used as a children’s toy, the uncertain course of the isolated object providing entertainment or, alternatively, as a part of a greater whole (transportation as amusement, end unto itself).
Ideally, the wheel should be round…