I didn't get to see my co-worker setting it up, but she told me that she'd put a chair in the middle and used some rope, marked off at equal intervals to make the circles. It's a full 11 circuit labyrinth, like the one at Chartres Cathedral (and Grace Cathedral in SF). We had a nice talk about how she'd fallen in love with them in Ireland and that's where she first saw them. What really gets me excited is this makes me realize that you could create a labyrinth anywhere for a retreat. What a great part of the week of Inspiration!
On the way to my car, I stopped and took another picture, of the Palace Hotel. This is from the Stephenson ally: