The artist's of tribes of the Great Plains left their paper trail for centuries on rocks, cave walls, and buffalo robes and other animal skins. After contact with the white man the Native American artists began to use paper from the ledger books that traders used for record keeping, thus the term "ledger art".

The drawings were characteristic of the style that had persisted for centuries and culminated with the end of the proto-modern era of the Native American art movement.

It was at the end of this era and the beginning of the Modernistic era of the movement that Dorothy Dunn was teaching at the Santa Fe school. During her tenure she encouraged her students to continue the traditions of their predecessors in the "flat", or "primitive" art style. Here one can cite Dunn's unique concept of