Because he did.
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WHY?!? Because he wanted to.
You need to look at his influenes. He has them in "Noh Theatre", Meyerholds "Biomechanics, Jaques le coq, Mime, "Kabuki Theatre". I don't know why but he creates cultural pieces and he is a very clever man.
The best-known might be Henri Rousseau 'Le Douanier'1844-1910.
Une soirée chez madame Geoffrin Or / le salon de madame Geoffrin is a painting by Lemonnier (wikipedia article in link)
Le tableau means 'the (black)board' when in a classroom setting. For an artist, the tableau is a painting.