ART DIALOGUES are free docent-led tours designed for adults presented at the Palo Alto Art Center. Docents are specially trained to illuminate the content and aesthetics of the images and objects on display. Tours last 30 to 45 minutes. Regular "public" tours, Saturdays at 2 p.m., during exhibitions. "Private" and "family" tours (geared for teens and adults), may be arranged for after 2 pm weekdays. For more information, please call 650-329-2370 or 650-329-2366.