A box situated behind a wall can be picked up and brought to the front of the wall without creating in the box-wall system a tendency to return to its former state.
Such a system is reorderable. The box and wall exist relative to one another as separate entities.
A reflexible system is one in which its parts return to default positions when the cause of the 'deformation' is removed.
A true reflexible system (one which is absolutely unbreakable) is indicative of identity in the logical sense.
Since it is impossible (see LP #12) to transmit an effect through space instantaneously, any indivisible unit having extension, such as a positional field, must bend in order to move. Thus, the center of an accelerating field may move first to be followed by the rest of the field or, part of the field may move followed by its center thereby preserving the identity of the point+field system.