Third Fridays belong to Durham's Art Walk, and tonight, the Durham Art Guild is hosting its Annual Members Show, which promises a smorgasbord of works in many media by professionals and amateurs alike, and a chance to mix and mingle with the local art community. 5 to 7 p.m. Through Aug. 31. 120 Morris St., Durham 560-2713, www.durhamartguild.com.

In the Allenton Gallery of the Durham Arts Council Building (also housing the DAG), Gretchen Morrissey's "Channel Markers" responds to global warming trends in marine environments. In "Rx Reef Bay," the white-on-white relief printing references bleaching, which threatens coral reefs. Superimposing the image of the first aid cross in blue and green, she poses the possibility of return to health for endangered marine life.

Don't miss the work of Curtis Bartone in the Semans Gallery upstairs, where the Savannah, Ga., artist presents "Variations of Order." Beautifully rendered birds and flora create foreground "frames" for scenes glimpsed through their intricate arabesques, often glaring juxtapositions. In "Drift," pelicans, cranes and thistles weave in front of the towers of a nuclear plant in the distance. "Candy" correlates a poodle, oversized chocolate bonbons and topiary trees. Wispy silverpoint etchings perfectly capture the mood of the tentative relations between man and nature. Lush paintings depict nightscapes heavy with orchids, conveying a smothering unease. Through Sunday.

At Bull City Arts Collaborative, see "Reconstitution," by UNC-Greensboro MFA grads Jeff Bell and Peter Goff, who both work with found materials. Goff projects wiry linear elements from the wall into surrounding space, while Bell combines reconfigured parts of unrelated machines and objects for floor-based works. The closing reception is tonight from 6 to 9. 401-B1 Foster St., Durham, 949-4847, www.bullcityarts.org

Branch Gallery (not part of this Third Friday art walk, but open until 6 tonight) continues two William Cordova-curated projects through July 26. "Casa de carton," eight artists' multicultural take on ephemera, suggests new life for humble materials, and alludes to the improvisational life of the street. In "Everything Real and Imagined, Occupying the Same Space," a grisaille collage by Derrick Adams, a central magician figure spouting the printed banner "Believe" is surrounded by glittery shoes, unicorns, stars, crosses, flying saucers and butterflies. Jorge Pantoja's neat miniatures also charm. Cordova's "the young lords," a plastic-sleeved, tinfoil-backed text that hangs from the ceiling, presents a hermetic puzzle. In Gallery 2, he selects "up against the wall," historical photographs by Ilka Hartmann, chronicling radical political movements since the 1960s. Subjects include the Black Power and American Indian movements, as well as migrant workers, and tie into Cordova's cause of bringing marginalized histories to light. 401-C Foster St. Durham. 918-1116, www.branchgallery.com.

On Saturday, Craven Allen Gallery in Durham hosts an opening reception from 5 to 7 p.m. for "The Art of Framemaking," paying tribute to the fine craftsmanship of hand-carved and water-gilded mirror frames -- works of art in themselves -- by master framer Edward Wright and his colleague, Brendan Love. 1106 Broad St., Durham. 286-4837, www.cravenallengallery.com.

Also Saturday, Tyndall Galleries in Chapel Hill opens an impressive new show of figurative paintings by Richard Garrison inspired by the mystical principles underlying Pythagorean geometry. 7 to 9 p.m. 201 S. Estes Drive, Chapel Hill. 942-2290, www.tyndallgalleries.com.