Rudolf Otto . What does it actually mean

Rudolf Albert Hamburger (3 May 1903 – 1 December 1980) was a German Bauhaus-inspired architect. Many of his most important commissions were undertaken in Shanghai where he lived and worked between 1930 and 1936. Late in 1930, his wife Ursula Kuczynski was recruited to work for Soviet intelligence; he supported her espionage related activities in various practical ways until their divorce in 1939, after which he became involved with spying for the Soviets on his own account. By 1943 he had ended …