In 2010, at the world's largest arts festival in Edinburgh, former Turner Prize winner, Martin Creed was all over the city. His ballet Work No. 1020 was at the Traverse Theatre; he presented his new book, Works, during the literary festival; and also had an exhibition Down Over Up at The Fruitmarket Gallery in which he showed a selection of works that focus on stacking and progression in size, height and tone. A musical staircase plays a different note for every step you take, a lift sings scales as you move from one floor to the other, and a row of prickly green cacti, lined up small to large, confront you in the gallery.