In the world of Architectural Visualisation one needs to keep ones eyes open for any possible project resource. You could be strolling past a building that has a certain texture on it or see a road or path detail that could be used on a project. A 3D visualiser should always be on the lookout for such textures and details. A camera is often kept close by to snap a shot for reference purposes or to be used as a texture or part of a photomontage.
The particular sky above was one such occasion when the camera was needed and it was close to hand. The high-resolution version of this image has been saved as a resource. It will make a beautiful background to a night view.