In the text “Of Other Spaces” (“Des espaces autres”, 1967), Foucault takes the garden as the oldest example of a heterotopia, a fragment of the world that contains its totality.

Michel Foucault, “Of Other Spaces” (“Des espaces autres”), lecture given on 14 March 1967 at the Cercle d’études architecturales, published in Architecture, Mouvement, Continuité, no. 5, 1984, pp. 46–49.