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People visit newly-built ice sculptures illuminated by coloured lights during a trial operation of the 16th Harbin Ice and Snow World in Harbin SHENG LI/REUTERS

People visit newly-built ice sculptures illuminated by coloured lights during a trial operation of the 16th Harbin Ice and Snow World in Harbin SHENG LI/REUTERS

Workers polish a snow sculpture ahead of the 16th Harbin Ice and Snow World in Harbin SHENG LI/REUTERS

Workers polish a snow sculpture ahead of the 31st Harbin International Ice and Snow Festival in Harbin KIM KYUNG-HOON/REUTERS

A visitor makes her way in a maze which is made by ice bricks ahead of the 31st Harbin International Ice and Snow Festival in the northern city of Harbin, Heilongjiang province KIM KYUNG-HOON/REUTERS

Visitors walk past a train-shaped ice sculpture ahead of the 31st Harbin International Ice and Snow Festival in the northern city of Harbin KIM KYUNG-HOON/REUTERS

Visitors take pictures with a bell which is displayed with ice sculptures ahead of the 31st Harbin International Ice and Snow Festival in the northern city of Harbin KIM KYUNG-HOON/REUTERS

A woman rides a slide on an ice sculpture ahead of the 31st Harbin International Ice and Snow Festival in the northern city of Harbin KIM KYUNG-HOON/REUTERS

Visitors use kaleidoscopes which are displayed with ice sculptures ahead of the 31st Harbin International Ice and Snow Festival in the northern city of Harbin, Heilongjiang province KIM KYUNG-HOON/REUTERS

A visitor has his picture taken with a piano-shaped ice sculpture ahead of the 31st Harbin International Ice and Snow Festival in the northern city of Harbin KIM KYUNG-HOON/REUTERS

A worker polishes a snow sculpture ahead of the 31st Harbin International Ice and Snow Festival in the northern city of Harbin KIM KYUNG-HOON/REUTERS

A couple takes a picture with an ice sculpture ahead of the 31st Harbin International Ice and Snow Festival in the northern city of Harbin KIM KYUNG-HOON/REUTERS

A visitor takes a picture with an ice sculpture ahead of the 31st Harbin International Ice and Snow Festival in the northern city of Harbin KIM KYUNG-HOON/REUTERS

A worker polishes an ice sculpture ahead of the 31st Harbin International Ice and Snow Festival in the northern city of Harbin KIM KYUNG-HOON/REUTERS

Visitors look around ice sculptures ahead of the 31st Harbin International Ice and Snow Festival in the northern city of Harbin KIM KYUNG-HOON/REUTERS

Workers polish a snow sculpture ahead of the 31st Harbin International Ice and Snow Festival in Harbin KIM KYUNG-HOON/REUTERS

Visitors walking past an ice sculpture are seen through a frozen window ahead of the 31st Harbin International Ice and Snow Festival in the northern city of Harbin, Heilongjiang province KIM KYUNG-HOON/REUTERS

People visit a maze which was built by ice bricks and illuminated by coloured lights during a trial operation ahead of the 31st Harbin International Ice and Snow Festival in the northern city of Harbin KIM KYUNG-HOON/REUTERS

A man rides a slide on an ice sculpture illuminated by coloured lights during a trial operation ahead of the 31st Harbin International Ice and Snow Festival in the northern city of Harbin KIM KYUNG-HOON/REUTERS

People visit ice sculptures illuminated by coloured lights during a trial operation ahead of the 31st Harbin International Ice and Snow Festival in the northern city of Harbin KIM KYUNG-HOON/REUTERS

People visit ice sculptures illuminated by coloured lights during a trial operation ahead of the 31st Harbin International Ice and Snow Festival in the northern city of Harbin KIM KYUNG-HOON/REUTERS

People visit ice sculptures illuminated by coloured lights during a trial operation ahead of the 31st Harbin International Ice and Snow Festival in the northern city of Harbin KIM KYUNG-HOON/REUTERS

People visit ice sculptures illuminated by coloured lights during a trial operation ahead of the 31st Harbin International Ice and Snow Festival in the northern city of Harbin KIM KYUNG-HOON/REUTERS

Tourists sit on a horse-drawn carriage in front of ice sculptures illuminated by coloured lights, during a trial operation ahead of the 31st Harbin International Ice and Snow Festival in the northern city of Harbin KIM KYUNG-HOON/REUTERS

Children ride a slide on ice sculptures illuminated by coloured lights during opening day of 31st Harbin International Ice and Snow Festival in northern city of Harbin KIM KYUNG-HOON/REUTERS

A woman rides a slide on ice sculptures illuminated by coloured lights during opening day of the 31st Harbin International Ice and Snow Festival in the northern city of Harbin KIM KYUNG-HOON/REUTERS

A woman takes her souvenir picture with a white fox in front of ice sculptures illuminated by coloured lights during the opening day of the 31st Harbin International Ice and Snow Festival in the northern city of Harbin KIM KYUNG-HOON/REUTERS

People ride slides on ice sculptures illuminated by coloured lights during opening day of 31st Harbin International Ice and Snow Festival in the northern city of Harbin KIM KYUNG-HOON/REUTERS

People visit ice sculptures illuminated by coloured lights during the opening day of the 31st Harbin International Ice and Snow Festival in the northern city of Harbin KIM KYUNG-HOON/REUTERS

People visit ice sculptures illuminated by coloured lights during the opening day of the 31st Harbin International Ice and Snow Festival in the northern city of Harbin KIM KYUNG-HOON/REUTERS

People heading to 31st Harbin International Ice and Snow Festival venue are silhouetted against ice sculptures illuminated by coloured lights at opening day in northern city of Harbin KIM KYUNG-HOON/REUTERS

A woman looks for space to hang her red ribbon bearing her wish on an ice sculpture illuminated by coloured light during the opening day of the 31st Harbin International Ice and Snow Festival in the northern city of Harbin KIM KYUNG-HOON/REUTERS

The moon rises over ice sculptures illuminated by coloured lights during the opening day of the 31st Harbin International Ice and Snow Festival in the northern city of Harbin KIM KYUNG-HOON/REUTERS

Chinese lanterns are seen in front of ice sculptures illuminated by coloured lights during the opening day of the 31st Harbin International Ice and Snow Festival in the northern city of Harbin KIM KYUNG-HOON/REUTERS

People visit ice sculptures illuminated by coloured lights during the opening day of the 31st Harbin International Ice and Snow Festival in the northern city of Harbin KIM KYUNG-HOON/REUTERS

A woman rides horse-shaped ice sculpture iduring the opening day of the 31st Harbin International Ice and Snow Festival in the northern city of Harbin KIM KYUNG-HOON/REUTERS