Suddenly I had the strange sensation that his dusty retreating figure had in that instant grown larger. Indeed, the further he walked the larger he loomed, until I had to look up to him.
Visitors are treated to unobstructed views of Chicago from the building's west side and a heart-stopping vista of the street and Chicago River below - for those brave enough to look straight down.
But the Fringe is also about those hopefuls-stand-up comics, actors, writers and musicians-to be seen canvassing on the cobbled Royal Mile below the castle.