In the modernist era, the dominant ideology was that society could be re-engineered on the basis of scientific and technical knowledge, and on the basis of a popular consensus about the meaning of progress. From the second half of the 20th century, however, modernism was gradually eclipsed by postmodernism, which is skeptical about social engineering and features a lack of consensus about the meaning of progress. In the wake of rapid technological and social change, all the old certainties have broken down. This begins to destabilize every part of life, making almost everything malleable, changeable, transient and impermanent.