Ben Okri is admiring a bottle of mineral water. 'Isn't it a beautiful colour?' he says, holding the sapphire-blue glass up to the light. He asks the waiter for another bottle and a bag to carry them home. 'Shhh,' he whispers over the expensive water in London's ritzy Langham hotel.
'I don't want to be seen carrying these drinks. I don't want them to become too popular. I collect them.'