Designer James Johnson puts his latest invention to the test at a rehearsal for NVA’s Speed of Light. Surveying the landscape and the light suited runners below, James trials the energy-harvesting light staff that hundreds of walkers will use each night to ascend to the summit of Arthurs Seat this August. Each walker will become part of a mesmerising visual display which will animate Edinburgh’s iconic mountain throughout the Edinburgh International Festival. www.eif.co.uk/speedoflight

Photographer Alan McAteer