Because of Hurricane Sandy, New York City is actually getting a double dose of Canstruction this year. The fall 2012 edition of colorful constructions made out of food cans and boxes had to be moved to February 2013, and now the twenty-first annual competition is up and running through November 13 at the Winter Garden at Brookfield Place, formerly known as the World Financial Center. The architectural battle and fundraiser — visitors are asked to bring a can of high-quality, nonperishable food to donate — features more than two dozen creative structures built by teams referencing the international hunger crisis. As always, the overall construction is best viewed through a camera, but get up close and personal with the naked eye to see how ingenious many of the intricate designs are. You can vote for your favorite here; among the impressive competitors are Skanska USA’s “Riding Out Hunger,” Severud Associates’ “Zip-a-Deeing Hunger Away,” ads Engineers’ “Heroes Fighting Hunger,” Eleanor Roosevelt High School’s “Hunger Never Sleeps,” DeSimone Consulting Engineers’ “SHARKNADO — Take a Bite Out of Hunger,” Gilsanz Murray Steficek’s “Cloudy with a Chance of Tuna,” Leslie E. Robertson Associates’ “Pour Out Your Heart,” and STUDIOS architecture’s “We CAN Kill Hunger.” At the end of the competition, the structures are taken apart and the cans donated to City Harvest, so come on by, bring some nonperishable items, and help break last year’s take of more than 90,000 cans.