Thomas Ruff - ma.r.s. Galería Helga de Alvear Doctor Fourquet 12 28012 Madrid, Spain 9 May - 29 June 2013 Thomas Ruff returns to Galería Helga de Alvear to present his latest work. Entitled ma.r.s.—an acronym of "mars reconnaissance survey"—one of the leading exponents of the so-called School of Düsseldorf draws from a series…