http://www.freep.com/article/2011092...uminate-RenCen

General Motors is working with the City of Detroit to allow it to put more such LED bands of lighting on its RenCen world headquarters. The company would like to install vertical bands of lighting on the exterior elevator towers of the RenCen. And it wants the city's permission to relax its signage code so that GM could display a more varied menu of messages on the 25-foot sign high atop the RenCen's central tower.