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Updated: May 11, 2025
This is because the steering of the tricycle depends on a kinematical, that of the Otto on a dynamical principle. In another respect, no machine can approach the Otto; at almost any speed the rider can, if there is reason, instantly dismount, by which action he puts on the brakes, and the machine will save him from falling, stopping with him almost instantly.
There is, however, this fundamental difference between architectural and pictorial lines: the latter are usually pure kinematical lines, lines of free and un-resisted movement, while the former are usually dynamical, lines of force which move against the resistance of mass.
Sometimes, however, architectural lines and surfaces remain purely kinematical; on the inside of our rooms, for example, when the surfaces are smooth, and especially when they are decorated, we often feel no tension of conflicting forces, but only a quiet play of movements; it is as if the walls had been changed into the paper or paint that covers them.
When a series of stories is divided into three parts, a superior aesthetic effect is gained if the height of each story diminishes in some regular ratio from the bottom to the top, thus expressing the gradual overcoming of the downward force by the upward, the rhythm becomes dynamical as well as kinematical.
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