This book is about energy efficiency; sustainable architecture; natural materials; earth energy; mimicry; bringing light to life. ''Architectural Competitions give You the opportunity to choose, to have a wide range of design tasks and to look and see where you are in this and what you can do in architecture... All architects generally live their lives in their architecture." - Branislav Mitrovic, a Serbian architect, professor at the Faculty of Architecture, speech at the Congress of Sustainable Architecture, Belgrade, October 6, 2019.