Author Barbara Martin and artists Cherise Hyslip and Marsha Oberlender sign their books from 1 to 4 p.m. today and 9 a.m. to 2 p.m. Friday at Bear Trax Gift and Gallery on the Homer Spit. Hyslip illustrated Martin’s book, “Offense Get Off of My Fence.” The book teaches children and adults how to guard their hearts from outside offenses. “Junk or Joy,” illustrated by Oberlender, uses metaphors to describe choices we make that feed our hearts from the inside. Both books will be on sale and also are available at www.powerme.us.com. A free, downloadable journal also is available at the website.