What was the effect of stained-glass windows in Gothic churches?

The painting demonstrates how pure, supple lines communicate tenderness and delicacy, even when viewed from a distance, as was often the case with medieval church glass. Simple fields of color (including the silver stain used in the yellow halos) complete the radiant effect. This window was originally meant to go up ...

The stained-glass windows allowed natural light to shine into Gothic churches; creating a multi-color environment. The brightness and warmth fostered a religious feeling. The stained-glass windows also presented stories and scenes from the bible. Basically they were the multi-media displays back in the days.