The tricky part is that this geometry will vary as all the various
hinge points move and since the movement is different side to side and front to back (and in at least two different axes) the point about which the car rolls moves as well.
Yet, Kahn's
pointed concentration on hue and luminescence
moves beyond the constraints of abstract expressionism, in which his teacher worked, to a kind of representation that artfully transcends overt description or narrative, even while maintaining a kind of painterly lyricism
hinged entirely on color and its unique application.