It’s the first of the month—October already!—and that means it’s time for another Washingtonian.com photo contest. For this month’s theme, show us how you interpret the idea of contrast.

We want you to play on opposites and juxatposition: Dark and light? Big and small? Hot and cold? You decide—just get creative.

Veterans to this contest are probably familiar with how it works, but for all the newbies, here are the details: Send your submissions by noon on Friday, October 16, and our judges will pick the best shots to advance to the reader-voting round. Then we’ll open it up to you, the reader, to select a favorite. The winner will be published in the December issue of the magazine.

Photos—one per e-mail—should be sent to [email protected]. Be sure to include the photographer’s name, phone number, e-mail address, and place of residence, along with a sentence or two describing the photo and explaining why it fits the theme. Photos should be 300 dpi and at least four by six inches. And remember, both the photographer and the photo’s subject need to be from the Washington area, which includes the Maryland and Virginia suburbs.