Auguste Rodin redefined the idea of sculpture in European Art liberating it from the constraints of classicism and created three dimensional forms which pulsated with life and energy. His masterpiece, the Gates of Hell, is the greatest public sculpture of the 19th century, a work that obsessed him for almost 40 years, and which acted as a laboratory for Rodin imagination and which produced some of greatest sculptures of his career, works such as the Kiss and the Thinker.