Nobel Prize winner Werner Heisenberg’s classic account explains the central ideas of the quantum revolution, and his celebrated Uncertainty Principle. The theme of Heisenberg’s exposition is that words and concepts familiar in daily life can lose their meaning in the world of relativity and quantum physics. This in turn has profound philosophical implications for the nature of reality and for our total world view.‘It carries the reader, with remarkable clarity, from the esoteric world of atomic physics to the world of people, language and the conception of our shared reality’ Paul Davies.