The debut of nva's speed of light was actually part of this year's Edinburgh Festival where every night for a month runners took to the trails criss crossing the Salisbury Crags while walker audiences with glowing Gandalph walking sticks climbed to the top of Arthur's Seat to view. I participated on different nights as both a runner and a walker and I have to say it was an amazing experience. There's nothing like running about a hillside in the pitch dark whilst wearing a Tron suit to make you smile!!
