actually the "glimmer lines" are caused by some heavy duty physics.
Based on the "wave theory" of light, the lines are caused when two light-waves from a source of light become out of phase. When these two different phased light-waves hit an object and reflect, they combine.
Sometimes they combine and produce a net gain in light, appearing brighter than the surrounding areas. Other times they produce a net loss in light, appearing darker than the surrounding areas.
Searching for light wave interference on google will yeild countless hours of forumla and discussion trying to explain why this occurs.
It is the fact that light is susceptable to wave-interference that has earned light a dual-classifcation as both a wave and a particle. Neat stuff if ya ask me