Esther Chen, 6, outlines her art teacher’s hand while making a cave drawing at Park Avenue School in Auburn on Friday. Mary Baumbach, lower left, led a session in which students celebrated the book “Talking Walls” during Young Author’s Day. “Talking Walls” is by Margy Burns Knight, one of four Maine authors who made presentations throughout the day. Fourth-grader Miguel Rondon, 9, creates a cave drawing above Chen, a kindergartner.