For centuries the divided lite patterns in a window or a door have been inherent to the design of the architecture. Early on, the making of large pieces of glass was very difficult so multiple divided lites was the only way to make a larger window or door. Over the years glass sizes have dramatically increased, yet the desire for divisions in the glass still remains strong in many architectural designs.
There are two primary ways to divide the glass today. There is still a true division of the glass using multiple individual lites or there is a simulated division that can be used to create a similar appearance with better energy values. There are advantages with both approaches and each have different merits.