sentences:  The shape of the upper edges of the portraits was based on the shape of the coffin, and the lower edges were often used to turn the whole into a hexagon or octagon.After the funeral, the coffin portrait would often be hung on the walls of the church that the deceased had contributed to.In time, they increased in size – from 40 x 45 cm in the 17th century, to 70 x 72 cm in the 18th century.