1 / 4   Several cleaners climbed up the Singapore’ durian-shaped theaters, Esplanade, - Theatres on the Bay to kick off a cleaning work on the windows and “thorns” as well. /VCG Photo

2 / 4   Opened in 2002, the structures have 15,080 pieces of glass and over 7,000 triangular aluminum sunshades to protect the audience from Singapore’s intense heat. /VCG Photo

3 / 4   The symbolic “durians” are designed jointly by Britain’s Michael Wilford and Partners and the local DP Architects and consists of a concert hall with 1,600 seats and a theatre with around 2,000 seats. /VCG Photo

4 / 4   Koh Seow Chuan, the team leader of architects for Esplanade, told to DesignSingapore Council that the two shells with their spirit of lightness, change and new experience. /VCG Photo