The 20th Annual Canstruction® Design and Build Competition will be open to the public March 18-22 at MacArthur Center in Norfolk. Canstruction® is a unique charity art exhibition and event in which architectural and engineering firms compete to see who can best defy the laws of gravity by creating canned art structures assembled from canned food. Once the structures have been judged, all food from the competition will be donated to the Foodbank of Southeastern Virginia and the Eastern Shore.