He was attempting to
unite the force of gravity — which he had successfully described in his general theory of relativity — with the force of
electromagnetism, and the two forces are similar in many ways.
NOTHING to do with a Hollywood film - making process, technicolour takes us back to the beginning of the universe, when two of the fundamental forces of nature,
electromagnetism and the weak force (which governs particle decay within the atomic nucleus), were
united in a single force — the electroweak force.