Early in the afternoon of art activities for Zone 3 Community Sketchbook on July 16 in Allston, I photographed people of all ages engaged in adding to the very long stretch of inviting open wall. Two days later I came by again. Awed by the art that had been accomplished in one weekend, I couldn’t wait to share the impressive results. Here are selected photos, links, quotes, and notes to convey how this new phase of creativity in Zone 3 came to be.