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Washington-based photographer Maxwell MacKenzie came to prominence with his photographs of vernacular architecture, especially of barns in the West and Midwest, spotted as he flew above in an ultralight aircraft. Now the artist offers aerial photography almost exclusively, this time produced mostly in Minnesota. Like fellow aerial photographer Emmet Gowin, MacKenzie is fascinated by the improbably precise geometries of agriculture in the West, offering brilliant ambers and dusky olives in response to Gowin’s cool black-and-white shading. Plowed rows, concentric circles of pivot irrigation, and zigzagging swirls of tire tracks are each mesmerizing in their own way, but a few works stand out: one whose waves approximate a television interference pattern in blue and purple, and another that combines a Barnett Newman– esque zip of highway with sinuous, Brancusi-like curves of vegetation. MacKenzie also presents four Aaron Siskind–style close-ups of what looks to be carved tree bark, the inclusion of which suggests subject matter that could drive his next major exhibition. “Markings” is on view from 11 a.m. to 6 p.m. (see City List for other dates) at Addison/Ripley Fine Art, 1670 Wisconsin Ave. NW. Free. (202) 338-5180. (Louis Jacobson)