On a shape-changing call (usually from a Box to a Line or Wave),
the idea is to maintain the center point between the pairs of dancers.
In the above example, dancers
and
finish such that their center point is the original center point between dancers
and
. Similarly, dancers
and
finish such that their center point is the original center point between dancers
and
(which just happens to be the original starting position of dancer
).
EN: 135