So he imagined that the world had four dimensions of space, not three, and imagined that electromagnetism was warps and curves in that fourth dimension. Now here's the thing: when he wrote down the equations describing warps and curves in a universe with four space dimensions, not three, he found the old equations that Einstein had already derived in three dimensions -- those were for gravity -- but he found one more equation because of the one more dimension.
Ta kujutles, et ruumil on neli mõõdet, mitte kolm ja et elektromagnetism on kõverdumine selles neljandas mõõtmes. Asi on selles, et kui ta kirjutas välja kõverdumist kirjeldavad võrrandid neljamõõtmelisele, mitte kolmemõõtmelisele ruumile, leidis ta Einsteini tuletatud kolme mõõtme võrrandid - need olid gravitatsiooni jaoks - aga ta leidis veel ühe, sest oli veel üks mõõde.