The July 2015 issue of PLSN (Projection, Lights and Staging News) magazine features an article titled The Deconstruction of Rush where Rush lighting director Howard Ungerleider breaks down Rush's R40 Live tour stage production.

... Before every Rush tour, the artistic team, including creative director Dale Heslip, producer Allan Weinrib, lead singer/bassist Geddy Lee (Allan's older brother) and Howard Ungerleider start by getting together for some new ideas. Prior to their latest brainstorming session, Dale came up with an idea of ...

The article contains a number of tour spoilers (obviously) and you can read the entire thing online here. Thanks to Eric at Power Windows for the heads up.