The renowned physicist John Archibald Wheeler summed up his long and illustrious career under three headings – three thematic periods that characterized his work. He called the first period, “Everything is Particles.” This covered the time when he worked alongside the legendary Niels Bohrs to understand nuclear fission and was drawn into the famous Manhattan Project.
Wheeler called his second period, “Everything is Fields,” referring to the effect that the strong and weak nuclear forces, electromagnetism and gravity have on all matter and space-time.
He titled the final stage of his career, “Everything is Information.”