What is the most memorable piece of typography you have come across? “I found it in a portable toilet at the Glastonbury festival. If you’ve ever been to a large public festival you will know how grim the toilets are. I have mixed feelings about this piece. I love it. However, it is so good that I am annoyed by the fact that I didn’t come up with it. I have no idea who created it. I’ve had lengthy discussions about whether it was premeditated or a spontaneous act. I hope one day to find out.”