ABSTRACT
Insertion, going-into, going-through and right-angular attachment In human childhood, the discoveries of certain key structures are important landmark events in development. These discoveries lead to the formation of what I think of as structural principles. One important structural achievement is being able to connect, join or link things together in some way. The making of angular or near-right-angular joins is one such powerful, key structure. This is also true for the chimpanzee and we have already encountered an example earlier, when Nkosi placed a straightish branch at right-angles on top of a horizontal beam making a near right angular cross-over (see page 197). Another important dynamic structure is that of going-through. Some kinds of closure or bound-volume such as tube-like forms offer a passage of movement right through, by going into an entrance at one side (and, in some cases, coming out again through an exit at the other). This occurs on many scales. In both human and chimpanzee development, we see this dynamic-structure at both close-up, miniaturised scale, with handheld objects or toys being made to penetrate tubes and tunnels of various kinds and at whole-body scale, in which tubular volumes are bodily climbed through. One example of the former is the observation of Joel and the coffee-grinder I described near the beginning of the book; other examples include the following developmental sequence of Rah.
