An original SF book that challenges the human concept of things, relativity, and many more. An exciting novel, a poignant style, engaging, truthful about the behavior of the protagonists. A book I have to write, bright. Bright vis-à-vis core issues even basic rights, illuminated by any law contradicting its concept "natural" light by the realism of a subject a priori incongruous ... and abroad. A novel, period. But the short, too short to support a complex subject.