How much would you pay for a banana attached to a wall with a piece of duck-tape? $6.2m (£4.9m)?! That is what someone paid in a Sotheby’s auction in New York last week (https://www.sothebys.com). The artwork, called ‘Comedian’, comes with instructions on how to replace the banana whenever it rots so, even though it was originally created by Maurizio Cattelan...