Remember when mum always used to say, 'Don't play with your food'? Well, apparently, not everyone listened.

On 24 June in Canary Wharf shopping malls and the lobby of skyscraper One Canada Square, architects, designers and engineers competed in teams of five during the 20th anniversary of Canstruction - a 12-hour design competition where contestants create sculptures entirely out of canned food.

The Canary Wharf branch of grocery chain Waitrose as well as food retailer AF Blakemore provided the contestants with 40,000 cans to build their designs. Engineering practice Thornton Tomasetti selected yellow and red cans of Heinz Cooked Spaghetti to create a rocket ship while others choose baby blue Heinz Baked Beans cans to design irregularly shaped archways.

The event, originally started in the US and now popular in 170 cities worldwide, made its London debut during the London Festival of Architecture, a 16-day celebration of architecture and design throughout the capital. The festival's theme, 'A Playful City,' perfectly mimics the fun, almost childlike, concept of building sculptures from cans.

The sculptures will be judged on 27 June and the winner will go on to compete in the International Canstruction Competition in the US next year. Until then, the cans remain on exhibition until 7 July, where upon deconstruction, UK-based food charity FaireShare will distribute the 16 tonnes of canned items to over 6,000 people in need throughout the capital.