The reason is that, not only is it visually very effective, it's also enormously practical! Paul Blonden (bending down, almost out of sight in the left-hand picture. The guy standing is Mike Carpenter, erstwhile crew member) who dreamt it up, had improved upon his design for the first round by employing dowels for its set up. This meant that the wall could be transported in smaller sections, and assembled quickly and securely for performance. If you're wondering why we'd go to all the bother, it's because festival rules say that companies only have ten minutes to put the set on stage, and so anything – anything! – you can do to ensure the set goes up quickly is a good thing!