 But it can offer a non-causal explanation of change: a change is the consequence of the qualities of several different objects persisting over some period of time. Qualities are simultaneous with their causes but they need not be instantaneous or short-lived. Motion is a quality. Several moving objects which continue to exist for some time may arrive at a mutual configuration that produces qualities which did not previously exist, e.g., several moving globs of paint and a canvas collide. The collision is explained by the paths of the moving objects prior to their union in an artistic composition. Shepherd contrasts the necessary connection of cause and effect with a sort of necessary connection between temporal antecedents and consequents (EASP: 131). The latter is the invariable sequence of successive effects produced by the same object meeting with several different objects in a regular order, e.g., when eating bread, one typically has successive sensations of yielding texture, taste, and fullness in the stomach. It is necessary that if a piece of bread mixes with the sensory organs in the usual order--hands, mouth and tongue, stomach—this series of sensations occurs (EASP: 125–30). 