“The Book of the Dead was a third phase in the evolution of funerary texts. Beginning with the pyramid of Unas (c. 2345 B.C.), the walls and passages of the pyramids were covered with the pyramid texts of hieroglyphic writings, including myths, hymns, and prayers relating to the godlike pharaoh’s life in the afterworld. This practice was followed by the coffin texts. All surfaces of the wooden coffin and/or stone sarcophagus were covered with writings and often illustrated with pictures of possessions for use in the afterlife. Thus, high officials and noblemen could enjoy the benefits of funerary texts even though the cost of a pyramid was beyond their means.
The dawning of the New Kingdom, around 1580 B.C., saw papyrus manuscripts come into use for funerary texts. Even citizens of fairly limited means could afford to have at least simple papyri to accomany them on the journey into the afterlife. From pyramid to coffin to papyri—this evolution toward cheaper and more widespread use of funerary texts paralleled the increasingly democratic and secular aspects of Egyptian life.”
—Phil Meggs & Alston Purvis, Meggs’ History of Graphic Design, 2006.