orologio en Altadefinizione. Today, Jiří Havelka and HaDivadlo's cult production, inspired by Einstein's theory of relativity and the "thought explosion" that this theory provoked, is a witty, cheeky, and inquisitive theatrical experiment that verifies, right before the audience's eyes, what Einstein's discovery means in practice for space and time. In the first part of the performance, a physicist styled after A. Einstein introduces us to the basic concepts of his theory. In the second part, the stage becomes Einstein's space-time, where the individual characters traveling by train to Zurich, together with the audience, experience firsthand the functioning of the world that began on May 29, 1919. That was when the truth of his theory of the universe was confirmed.