Cruz-Diez : reflection on color [This book, and its Spanish edition ..., are published on the occasio of the exhibition "Carlos Cruz-Diez: Color Happens" At the Museu d'Art Espanyol Contemporani, Palma (Fudación Juan March), from February 25 to June 27, 2009, and the Museo de Arte Abstracto Espanol, Cuenca (Fundación Juan March), from July 17 to November 15, 2009.]