The initiator of these observations was the Polish-American scholar Alfred Korybski. He most likely influenced Magritte’s art. Korzybski said “The Map is Not the Territory”. What he means is that the territory is the world and the map a generalization we use to make sense of it. It also proposes that we don’t have unmediated contact with the external world/reality (Expand your World). Korybski saw that language was at the same time the thing that made possible cultural development of the human race and at the same time the one that harmed it’s perception (Expand your World). When we communicate an experience, we often use generalizations in our words, and those generalizations leave out the things that made that event unique; they leave out the concrete experience, which results in a small abstraction of things out of a whole.
For more on the concept, “the map is not the territory”