Human perfection and technical perfection are incompatible. If we strive for one, we must sacrifice the other: there is, in any case, a parting of the ways. Whoever realises this will do cleaner work one way or the other. Technical perfection strives towards the calculable, human perfection towards the incalculable. Perfect mechanisms - around which, therefore, stands an uncanny but fascinating halo of brilliance - evoke both fear and Titanic pride which will be humbled not by insight but only by catastrophe. The fear and enthusiasm we experience at the sight of perfect mechanisms are in exact contrast to the happiness we feel at the sight of a perfect work of art. We sense an attack on our integrity, on our wholeness. That arms and legs are lost or harmed is not yet the greatest danger.