This year's theme for the Booklovers Ball is Explore! Through exploration, questioning, and creativity mankind has impacted their world for good or ill. The Library wishes to help you explore your world. These films celebrate the indomitable spirit of the explorer.
It talks about historic Sanborn Fire Insurance maps that show historical views of Denver and other places. "As buildings changed, the maps were updated with paste-overs.... It's like showing geologic layers of Denver."