The builder of my house was an eccentric soul. In a storage room, he put a single square window on the north wall, centered horizontally on the wall, and with the bottom 36" above the floor and the top 72" above the floor. This window did not provide enough light during the day, so I asked a remodeler if he could improve the situation. He replaced that window with another square window, also centered horizontally, 36" high and placed 36" from the floor, with the same type of glass.
This immediately improved the amount of light I was getting during the day. How did he make this improvement?