In 1967, Penrose invented the twistor theory which maps geometric objects in Minkowski space into the 4-dimensional complex space with the metric signature (2,2).
== Življenje in delo ==Penrose je sin genetika, psihiatra, matematika in šahovskega teoretika Lionela Sharplesa Penrosea in Margaret Leathes, ter vnuk fiziologa in biokemika Johna Beresforda Leathesa.