Razor's Edge (Russian: Лезвие бритвы, Lezvie britvy, Edge of the Razor) is a 1963 science fiction novel by the Soviet writer and paleontologist Ivan Yefremov. It includes four parts and is notable for a huge amount of the scientific facts and dynamism.
Efremov used the word "eidetica" as an ability to a deliberate dreams, when man dreams in full details about something that is known to him only as told by friends, read in books or seen in pictures. In this novel such capability to see such panoramic color images appears in one of the novel characters after he was contused in time of Great Patriotic War. Later on he arrives in Moscow, USSR to ask the doctors explain this symptom. While healed he sees an even more detailed dream, but after he loses his unique ability.