Deviation

Any movement that begins in a given direction undergoes a deviation at a certain moment.— Mouravieff
=== Deviation of movement ===
Deviation is the action of departing from an established course. Being action, deviation is a movement. Any movement that begins in a given direction undergoes a deviation at a certain moment. For a movement going towards a definite goal to continue without deviation in the same direction, it is necessary to impart to it adequate additional impulses at specific moments and points. If left to itself, by the third deviation a movement which follows a definite direction is found to be going in the diametrically opposite direction.
== Rhizomata ==
Movement