The medieval nominalist John Duns Scotus, who lived in the late 1200s and early 1300s said that the relationship between thoughts, languages, and symbols and what they depict is like that of a sign hanging on a tavern door indicating that drink can be gotten there. You cannot drink the sign. Actually, the common sign of the day was a wreath. So, you can’t drink a wreath. Ludwig Wittgenstein’s saying, “The map is not the territory” became so common a mantra that people who have never heard of Wittgenstein or his “Tractatus Logico-Philosophicus” still recognize this statement as if it were a cliché.