Fifteenth century Europeans'knew'that the sky was made of closed concentric crystal spheres, rotating around a central earth and carrying the stars and planets. That'knowledge'structured everything they did and thought, because it told them the truth. Then Galileo's telescope changed the truth. As a result, a hundred years later everybody'knew'that the universe was open and infinite, working like a giant clock. Architecture, music, literature, science, economics, art, politics - everything - changed, mirroring the new view created by the change in the knowledge. The medium by which perceptive intuition and the rigorous discipline of shaping became compatible was technology. Technelogos, the art of knowing how to make, fell naturally and historically into the realm of perceptive fundamentals... For the artist it verified scientifically what he had perceived emotionally, for the engineer it added the vast field of perceptive responses to the narrow limits of the laboratory experiment.