Werner Heisenberg the first to reinterpret the Dirac equation as a "classical" field equation for any point particle of spin ħ/2, itself subject to quantization conditions involving anti-commutators. Thus reinterpreting it as a (quantum) field equation accurately describing electrons, Heisenberg put matter on the same footing as electromagnetism: as being described by relativistic quantum field equations which allowed the possibility of particle creation and destruction. (Hermann Weyl had already described this in a 1929 letter to Albert Einstein.) Heisenberg's paper establishing quantum mechanics has puzzled physicists and historians. His methods assume that the reader is familiar with Kramers-Heisenberg transition probability calculations. The
The Tao of Physics a whole culture that subscribed to very similar ideas. Heisenberg said that this was a great help for him. Niels Bohr had a similar experience when he went to China. As a result of those influences, Bohr adopted the yin yang symbol as part of his family coat of arms when he was knighted in 1947. "The Tao of Physics" was followed by other books of the same genre like "The Hidden Connection", "The Turning Point" and "The Web of Life" in which Capra extended the argument of how Eastern mysticism and scientific findings of today relate, and how Eastern