A simple depiction in prismatic hues — pencil and lustrous color ... creating it drills into my heart. In other drawings, the 24-year-old Bear’s Heart depicted Cheyenne cosmology, dragonflies ...

Estimated to be more than 500 years old and just 2.75 by 2.75 inches, the drawing known simply as "Head of a Bear" will likely be sold for $11 million to $16.5 million, the auction house said.