Ecumene: the relationship of Mankind with the surface of the Earth (towards a definition of the ambient world). — Traditional milieux were characterised by an organic unity of the ambient world, in which the physical was not distinguished from the phenomenal. The modern classical western paradigm, established in the 17th century, replaced this with an alternative between the physical (the world in which the Earth moves) and the phenomenal (the world in which the sun moves) aspects of reality, thus destroying the unity of the ambient world. Yet, in the 20th century, the emergence of ecology on the one hand, and of phenomenology on the other, questioned this view. There remains to build a link between these two relational visions. This paper ...