ABSTRACT
The experiment reported in this chapter again deals with rotation. In this case, however, the subject no longer just follows a circular path drawn on a piece of cardboard or imposed on him by disks. Here it is a matter of discovering rotatory laws by making rotational movements. In large part, the subject makes the movements himself. An approach of this sort provides more information about the relationship between rotations and transformations that can be used in unraveling the problem of compositions. It allows us to examine that question by going back even to the preliminary but essential question posed in chapter 1 of knowing whether the initial comparisons and correspondences that prepare the way for transformations are sufficient to generate them or whether, on the contrary, it is transformations that determine and stabilize correspondences pending their composition.
