Rose windows originate grom gothic architectural tradition.

They give the visitors of what the structre is dedicated to and gives a grandiose look to the windows. They also lighten the interior with myystical light forming due to stained glasses.

The architect was trying to convey the story of the jesus on this particualr rose window which would have been visible when seen dierectly or at night(sorry about that). In addition to succesfully describing the story the location of rose window grasps the attention of the viewers.