This film documents the Rat Fair event organised by artist Lucy Kimbell at Camden Arts Centre, London in 2005 attended by 40 rats and 450 people. Activities for rats and people included a rat beauty parlour, memory and agility tests, and roborat racing. The highlight was the world premier of the "Is Your Rat an Artist?" drawing competition for humans, rats and software, inspired by the Morris water maze used in animal experiments. The Rat Fair was the result of months of conversation with and observation of people and rats working together in the fancy rat and scientific communities.