“It’s still an active development.” Charlotte Ito, 6, right, closes the lid of Book Bot outside of Mountain View Library in Mountain View, Calif., on Thursday, March 7, 2019.

The class is usually held on the fourth Monday of every month, from 6:30 to 8 p.m. in the program room of the Mountain View Public Library.

Residents in downtown Mountain View have gotten their first peek at the future with the debut of BookBot, the library’s newest non-human helper. A creation of Google’s Area 120 — an experimental ...