Vintage Style Jungle Wall Art Poster Print by John Dyer. 'River of Life, Rio Gregorió, Amazon'.Amazon rainforest fine art wall poster print by Earth Day artist John Dyer. Created deep in the Amazon rainforest whilst the artist was living with the Yawanaw tribe in Brazil. The spiritual snake of the sky and the spiritual snake of the ground feature in the image. "The Rio Gregori is the tributary of the Amazon river that the Yawanaw live on. The river provides not only the only way in and out of the tribe but a place to wash, fish, play, hunt & a