"Pocas veces en mi vida un hombre me ha proporcionado tanta dicha con su sola presencia como usted ha hecho", escribió Einstein a Bohr. "He aprendido mucho de usted, sobre todo de su sensible aproximación a los problemas científicos".
"I had several discussions with Heisenberg. I lived in England then [circa 1972], and I visited him several times in Munich and showed him the whole manuscript chapter by chapter. He was very interested and very open, and he told me something that I think is not known publicly because he never published it. He said that he was well aware of these parallels. While he was working on quantum theory he went to India to lecture and was a guest of Tagore. He talked a lot with Tagore about Indian philosophy. Heisenberg told me that these talks had helped him a lot with his work in physics, because they showed him that all these new ideas in quantum physics were in fact not all that crazy. He realized there was, in fact, 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. – Fritjof Capra, interviewed by Renee Weber in the book The Holographic Paradigm (page 217–218)"
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.