Cadavre exquis par contumace ...

[...] In Paris later I showed Magritte his painting that art dealer Iolas had exchanged with Max for one of his. It was one of those big green apples occupying the whole canavas, and it said, in that careful Magritte script, This is not an apple. One day Max took it up to his studio and painted in the middle of the apple a little barred window with a bird behind the bars. Underneath he wrote in the same nice letters: Ceci n'est pas un Magritte. So when Magritte happened around one day and saw the picture where it hung in the study, my relief flowed free as he laughed gently and walked away. [...]

Dorothea Tanning, Between Lives, (New York, W.W. Norton & Company Ltd, 2001), p.256