A lifelong interest into the culture and ways of indigenous populations, led Johan to many encounters with the native tribes of Brazil. While working on the re-urbanization plan of the city Manaus, he experienced doubts about the sense of introducing our visions of organization. His fascination with indigenous architecture, was followed by a continuous research, at many different sites around Brazil, and eventually was condensed into the book: The Architecture of the Amazonian Indians  

"Why the green hell? Because in order to live there one would have to change ones way of life and that is for most people, hell."