This volume shows the diverse ways in which Emiliano López and Mónica Rivera, a young architectural couple from Barcelona, have addressed the question of optimum space utilisation. It includes a series of photographs that the couple took while travelling, presented alongside their own remarkable constructions and treatises on important themes within the study of architecture. Scattered in between are visual case studies dedicated to seven residential buildings, which have been precisely designed to suit their specific spatial situations. The techniques López and Rivera use are described in detail. This exciting monographic collection is complemented by four essays, written by renowned guest authors, which elucidate López and Rivera's unique style. Text in English and Spanish.