Choice: a vending machine offers visitors the option to take packets of Himalayan Balsam seeds, a plant first introduced to Britain in the 19th century as an exotic garden species. People using the vending machine will be given information about this exuberant plant, its place within our landscape, and the human factors responsible for its presence. Free, no booking necessary Gallery 2. Sat 27 & Sun 28 Nov, Sat 4 & Sun 5 Dec, Sat 8 & Sun 9 Jan.