The cosmic-shear concept in the weak-lensing science of Richard Ellis is taken up. If the shear is dynamic--as is indeed the case since the lenses are all moving with up to 1% the speed of light--the cosmos becomes a seething cauldron in the sense of chaos theory. This picture amounts to a new statistical-mechanical situation which, in turn, implies a new entropy-like effect: the travelling light trajectory then suffers a distance-proportional redshift at its tip, much as the moving phase-space trajectory of a relaxing gas suffers a time-proportional increase of the momentary phase-space volume. The recently proposed supernova/acceleration probe (SNAP) satellite mission could be used to refute the conjecture that no added unidirectional global expansion is needed to explain the empirical Hubble law.