The feet of a character who is running or the wheels of a speeding auto need never touch the ground. As speed increases, objects can be in several places at once. This relativistic effect is easily seen in tooth and claw fights, in which a character's head may be glimpsed emerging from the cloud of altercation at several places simultaneously. Relativists propose that a single object has its worldline folded over several times, so that in the observer's frame there can be many objects at any given time, but in the object's proper frame, there is only one object. This destroys the Newtonian concept of simultaneity.
Theorists also disagree on what the limiting speed is.
Some say it is the speed of light, but others claim that it is the frame speed. This trompe l'oeil inconsistency has baffled generations, but at least it is known that whoever paints an entrance on a wall's surface to trick an opponent will be unable to pursue him into this theoretical space. The painter is flattened against the wall when he attempts to follow into the painting. This is ultimately the problem of art, not science. A violent rearrangement of feline matter is impermanent.