Language games in Magritte and Wittgenstein

The apparently-intrinsic juxtaposition of Ludwig Wittgenstein and René Magritte seems to provide some further clarification for the work of the Austrian philosopher as well as a theoretical framework to the work of the Belgian artist. What leads Wittgenstein to state that the word “red” has nothing to do with the colour red? What leads Magritte to maintain that a pipe “is not a pipe”? They both believe in the centrality of Saussure’s principle of the arbitrariness of the sign, thus supporting a semiotically-oriented solution.