There's a cycle-through interactive music experience at Spitalfields Market until 26 June. Inspired by the avant-garde Greek composer, the Xenakis Pavilion is part of the Spitalfields Festival (though it's more of a bus stop than something a cricket team could change in).
You bang chunks of wood and metal inside, or just move around a bit, and howly-grindy little loops of sound are set off. It's all fairly arbitrary and produces a series of unpleasant noises rather than anything recognisable as composed music, so captures the spirit of Xenakis very well.
You're not supposed to cycle through it, of course. But it's a great way of making a fast exit.