Wedging, Passing
and Locking
The upper and lower limbs are held in place on the
cage and pelvis by mortise and tenon, called ball-and-
socket joint and at elbow and knee by the ginglymus or
hinge joint. The surrounding muscles, by their position,
shape and size are capable of moving these joints in any
manner that the construction of the joints permits.
As movement occurs, and the body instinctively as-
sumes a position suited to the taking of some action, the
muscles, by contraction, produce the twisting and bending
of the masses. In so doing the muscles themselves ex-
pand, shorten and bulge, making smaller wedges or
varied forms connecting the larger and more solid masses.
This shortening and bulging of the muscles becomes an
assemblage of parts that pass into, over and around one
another, folding in and spreading out. It is these parts
passing into or over each other that gives the sense of
wedging or interlocking. This might be compared to the
folds in drapery: where the folds change, their outline
changes.
A form either passes around or enters into
the outline of the visible boundary of a figure.
It should be an indication of what it really is:
the outline of a form. Within this outline, for
the same reason, forms pass into and over other
forms. They wedge, mortise and interlock.
The outline of a figure may be so
drawn that it gives no sense of the
manifold smaller forms of which it
is composed. Again, the outline of a
figure may be so drawn that the
sense of the figure's depth, of the
wedging, interlocking and passing
of smaller forms within the larger
masses conveys to the mind an im-
pression of volume and solidity.