As the consequences of change accelerate, on the other hand, it is easier to discern causes. Another paradox of our time is the avid pursuit of a theory of change. Interest in formal causality seems to have declined after the sixteenth century, as did interest in analogy. But the artist picked up this interest where the philosophers left off and has always insisted on the formal (not just the efficient) causality of artefacts whether of individual or collective origin. (The Marxist claim to a theory of change may well be its major attraction in the West.)