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, Heilongjiang province, January 4, 2015 (Photo: 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, Heilongjiang province, January 4, 2015 (Photo: 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, Heilongjiang province, January 4, 2015 (Photo: 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, January 4, 2015 (Photo: 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, Heilongjiang province, January 4, 2015 (Photo: 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, Heilongjiang province, January 4, 2015 (Photo: 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, Heilongjiang province, January 4, 2015 (Photo: Reuters)
Workers polish a snow sculpture ahead of the 31st Harbin International Ice and Snow Festival in the northern city of Harbin, Heilongjiang province, January 4, 2015 (Photo: Reuters)
A visitor makes her way in a maze which is made by ice bricks ahead of the 31th Harbin International Ice and Snow Festival in the northern city of Harbin, Heilongjiang province, January 4, 2015 (Photo: Reuters)
Workers polish a snow sculpture ahead of the 31st Harbin International Ice and Snow Festival in the northern city of Harbin, Heilongjiang province, January 4, 2015 (Photo: Reuters)
Visitors look around ice sculptures ahead of the 31st Harbin International Ice and Snow Festival in the northern city of Harbin, Heilongjiang province, January 4, 2015. The winter festival will be officially opened on January 5, 2015 (Photo: 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, Heilongjiang province, January 4, 2015 (Photo: Reuters)