Every television program must be a complete package in itself. No previous knowledge is to be required. There must not be even a hint that learning is hierarchical, that it is an edifice constructed on a foundation. The learner must be allowed to enter at any point without prejudice. This is why you shall never hear or see a television program begin with the caution that if the viewer has not seen the previous programs, this one will be meaningless. Television is a nongraded curriculum and excludes no viewer for any reason, at any time. In other words, in doing away with the idea of sequence and continuity in education, television undermines the idea that sequence and continuity have anything to do with thought itself.