What’s green and hangs in the drawing room?
– A green herring
Why in the drawing room?
– because it was possible to hang it there
– it was painted to make it harder to guess
Roman Jakobson, ‘On Realism’, in Language in Literature, (Ed. Krystyna Pomorska and Stephen Rudy), Cambridge, Mass.:Harvard University Press, 1987, pp.19-27, http://monoskop.org/images/b/be/Jakobson_Roman_1922_1987_On_Realism_in_Art.pdf