Focus on this artwork and analyze the 1913 in context.
Niels Bohr presents his quantum model of the atom. — Robert Millikan measures the fundamental unit of electric charge — Georges Sagnac demonstrates the Sagnac effect, showing that light propagates at a speed independent of the speed of its source. — William Henry Bragg and William Lawrence Bragg work out the Bragg condition for strong X-ray reflection — Publication of the 3rd volume of Principia Mathematica by Alfred North Whitehead and Bertrand Russell, one of the most important and seminal works in mathematical logic and philosophy — February 17 - The Armory Show opens in New York City. It displays works of artists who are to become some of the most influential painters of the early 20th century — Marcel Proust, Swann's Way — D. H. Lawrence, Sons and Lovers — Franz Kafka, The Judgement — Blaise Cendrars, La prose du Transsibérien et de la Petite Jehanne de France — Guillaume Apollinaire, Alcools: Poemes 1898-1913, edited by Tristan Tzara — Blaise Cendrars, La prose du Transsibérien et de la Petite Jehanne de France, a collaborative artists' book with near abstract pochoir print by Sonia Delaunay-Terk — Francis Jammes, Feuilles dans le vent — 29 May - Igor Stravinsky's ballet score The Rite of Spring is premiered in Paris — 12 December - Vincenzo Perugia tries to sell Mona Lisa in Florence and is arrested. Apollinaire had been a suspect in Paris for its theft — 30 December - Italy returns Mona Lisa to France — 23 September - Aviator Roland Garros flies over the Mediterranean
William Henry Bragg pochoir Sonia Delaunay-Terk Niels Bohr ballet quantum model of the atom Tristan Tzara artists' book Franz Kafka Guillaume Apollinaire Alfred North Whitehead Swann's Way Blaise Cendrars Roland Garros Bertrand Russell fundamental unit of electric charge Sonia Delaunay Marcel Proust Italy Lawrence Bragg Sons and Lovers Robert Millikan D. H. Lawrence Sagnac effect Georges Sagnac Igor Stravinsky The Judgement La prose du Transsibérien et de la Petite Jehanne de France Paris Francis Jammes Vincenzo Perugia Mediterranean The Rite of Spring Armory Show William Lawrence Bragg Mona Lisa Principia Mathematica