The Brazilian artist Hélio Oiticica is considered one of the most important exponents of contemporary art in South America. His works were shown at documenta X and featured in a number of solo exhibitions all around the world. In his multimedia room installations, Oiticica usually made use of social themes and experimental elements as well as set pieces from popular culture, film and music. This book focuses on works which have rarely been seen elsewhere, works in which Oiticica questions the traditional relationship between the audience and the world of the movies. The term 'quasi- cinemas', which he coined in New York in the seventies together with the Brazilian film director Neville D'Almeida, stands for a combination of slide projection and music. One of these is the lavish nine-part sequence of installations called Block Experiments in Cosmococa, which is for the first time presented to a larger audience in this book. Also included are notes to Oiticica's slide series Neyrótika and his only film Agripina é Roma-Manhattan as well as a series of the artist's own texts which are crucial for the understanding of his complex works of art.