The Indians often illustrated their history in ledger books, the type used to keep accounting records and journals. Their drawings, done with colored pencils, trade inks and crayons, depicted important events in their lives - battles, hunts and ceremonies. The drawings were done in a flat, pictographic style with little or no use of perspective. Early drawings were very simple, featuring stick figures. Later, a more detailed style illustrating clothing, ornamentation and weapons was developed.