...because, traditionally, windows were summaries of specific meanings, and therefore used to have some relevance
Notice here that the significance of the window - a Quatrefoil - has been altered: because of the «connotation» given by the eye, in the banner. This almost direct translation, changes the ancient value, and the mood, of the pretty small window.
Even different, Quatrelobes can be seen in Strawberry Hill, in the Gothic Revival Villa, conceived by Horace Walpole, in Twickenham, London**.