The degenerative disease ataxia derives its name from the Greek, meaning "without order". AtaXia is also the name of a dance created by choreographer Wayne McGregor , in association with neuroscientists, psychologists, spatial architects and computer programmers, to be premiered at Sadler's Wells. Isabel Hilton reports on this, and interviews Hari Kunzru about his new novel, Transmission. Producer Ariane Koek