The article investigates the interpretative function of the concept REALITY in John Berger’s essay about Vincent van Gogh’s art by applying the methodology of cognitive linguistics. Following Nikolay N. Boldyrev, the interpretative function of the language is considered in the article as the third main linguistic function. The theoretical and methodological foundations of the study are further developed with the idea, which is expressed by several researchers (V. V. Feshchenko, Ye. A. Yelina, U. A. Zharkova), that discourse about art performs an interpretative role. The aim of the study is to reveal the linguo-cognitive mechanisms that enable the concept REALITY to operate as a means of interpretation of van Gogh’s art in Berger’s essay. The research has demonstrated that before the concept REALITY is applied to the analysis of van Gogh’s paintings and drawings, this concept is explicitly interpreted in the essay. The following linguo-cognitive mechanisms are employed to make the content of the concept REALITY clear to the reader: actualization of the commonly known sense «reality is opposed to imagination», critical discussion of this sense, introduction of the conceptual metaphor REALITY IS THE OBJECT THAT SHOULD BE SALVAGED, and actualization of the selected fragments of the philosophical world image as well as scholarly world image, especially the conception of art for art’s sake and the conceptual metaphor REALITY IS SOMETHING THAT LIES BEHIND THE SCREEN CREATED BY THE CULTURE. Thus, having been thoroughly interpreted in the essay, the concept REALITY is used as an instrument of the interpretation of van Gogh’s artistic principles and artworks. The following linguo-cognitive mechanisms support the concept REALITY in its interpretative function: applying the conceptual metaphor REALITY IS SOMETHING THAT LIES BEHIND THE SCREEN CREATED BY THE CULTURE to read van Gogh’s letters, using the conceptual metaphor REALITY IS THE OBJECT THAT SHOULD BE SALVAGED to analyse the facts from the painter’s life, introducing the conceptual metaphor REALITY IS THE CONSUMING ITSELF PHOENIX, actualizing of the concepts WORK and PRODUCTION as the key concepts in the artist’s world image, utilizing the concepts WORK and PRODUCTION to interpret several of van Gogh’s paintings, applying the actualized conception of art for art’s sake to reveal van Gogh’s artistic principles, constructing the conceptual metaphors VAN GOGH’S ART IS APPROACHING THE WORLD and VAN GOGH’S ARTISTIC REPRESENTATION OF REALITY IS DISSOLVING IN REALITY, and constructing the conceptual metaphor VAN GOGH’S PAINTINGS ARE LASERS.