In conditions of darkness, how is landscape experienced when mediated by the artful staging of mass movement and artificial illumination? The article offers a response to this question of perception, phenomena and sensation, through culturally informed consideration of Speed of Light, a performance event staged in Holyrood Park, produced by arts charity NVA, during the 2012 Edinburgh International Festival. Speed of Light was a large-scale, open-air public artwork, illuminating the form and motion of walkers and runners, fusing the role of performer and spectator. Following an introduction to the event's design and delivery, and consideration of recent literatures on spaces of darkness and the illumination of landscape in contemporary socia...