'Nude women are only Art if there’s an urn in it,’ said Fred Colon.

This sounded a bit weak even to him, so he added, ‘or a plinth. Both is best, o’course. It’s a secret sign, see, that they put in to say that it’s Art and okay to look at.’

‘What about a potted plant?’

‘That’s okay if it’s in an urn.’

‘What about if it’s not got an urn or a plinth or a potted plant?’ said Nobby.

‘Have you one in mind, Nobby?’ said Colon suspiciously.

‘Yes, The Goddess Anoia Arising from the Cutlery,’ said Nobby....

— Terry Pratchett
Thud! (#Discworld #34)
#GNUTerryPratchett