At the previous place I worked we had a particularly large project with detailed spec crossing multiple powerpoint presentations of UI design. We ended up pasting it on the wall at the end of the cubicles - about 60 pages or so. I don't think I should post it here on this blog, I have photos of it, but I am not sure if the previous company would come after me or not for posting company sensitive information. I am guessing not as it is out in production now, but who knows.

Anyway, the point of the story is that the spec pages didn't move nicely from left to right, they grew out. As people finished a page of spec they posted it to the out edge of the scrum wall, so as the project continued we ended up with a hole in the middle of the wall defined by the absence of spec pages. I thought it was a nice emergent behavior from making the spec a physical item in the project.