Residents look at the sculptures built by canned food at the annual Canstruction Vancouver competition in Vancouver, Canada, April 30, 2016. Some 21 teams of architects, engineers, and schools competed at the 2016 Canstruction Vancouver, the anti-hunger annual canned food sculpture building competition showcasing sculptures made out of more than 80,000 of donated cans.Photo: Xinhua

Residents look at sculptures built by canned food at the annual Canstruction Vancouver competition in Vancouver, Canada, April 30, 2016. Some 21 teams of architects, engineers, and schools competed at the 2016 Canstruction Vancouver, the anti-hunger annual canned food sculpture building competition showcasing sculptures made out of more than 80,000 of donated cans.Photo:Xinhua

Residents look at sculptures built by canned food at the annual Canstruction Vancouver competition in Vancouver, Canada, April 30, 2016. Some 21 teams of architects, engineers, and schools competed at the 2016 Canstruction Vancouver, the anti-hunger annual canned food sculpture building competition showcasing sculptures made out of more than 80,000 of donated cans.Photo:Xinhua

A participant works on her can sculpture at the annual Canstruction Vancouver competition in Vancouver, Canada, April 30, 2016. Some 21 teams of architects, engineers, and schools competed at the 2016 Canstruction Vancouver, the anti-hunger annual canned food sculpture building competition showcasing sculptures made out of more than 80,000 of donated cans.Photo: Xinhua

A participant works on her can sculpture at the annual Canstruction Vancouver competition in Vancouver, Canada, April 30, 2016. Some 21 teams of architects, engineers, and schools competed at the 2016 Canstruction Vancouver, the anti-hunger annual canned food sculpture building competition showcasing sculptures made out of more than 80,000 of donated cans.Photo: Xinhua

Participants build their can sculpture at the annual Canstruction Vancouver competition in Vancouver, Canada, April 30, 2016. Some 21 teams of architects, engineers, and schools competed at the 2016 Canstruction Vancouver, the anti-hunger annual canned food sculpture building competition showcasing sculptures made out of more than 80,000 of donated cans.Photo: Xinhua

Participants build their can sculpture at the annual Canstruction Vancouver competition in Vancouver, Canada, April 30, 2016. Some 21 teams of architects, engineers, and schools competed at the 2016 Canstruction Vancouver, the anti-hunger annual canned food sculpture building competition showcasing sculptures made out of more than 80,000 of donated cans.Photo: Xinhua

Participants build their can sculpture at the annual Canstruction Vancouver competition in Vancouver, Canada, April 30, 2016. Some 21 teams of architects, engineers, and schools competed at the 2016 Canstruction Vancouver, the anti-hunger annual canned food sculpture building competition showcasing sculptures made out of more than 80,000 of donated cans.Photo: Xinhua