The Art Deco Clock of Shell Mex House

Standing 58 m (190 ft) tall, with 537,000 sq ft (49,900 m2) of floor space, Shell Mex House has 12 floors (plus basement and sub-basement) and is immediately recognizable from the River Thames and the South Bank by the clock tower positioned on the south side of the building (flanked by two large, hieratic figures at the south corners). The clock, which was known for a time as "Big Benzene", is the biggest clock face in London and second largest in the UK after the clock on the Liver Building in Liverpool, it was supplied by Gillett & Johnston of Croydon. It has faces looking towards the river and towards the Strand. It was described by architectural historian Nikolaus Pevsner as "thoroughly unsubtle, but...hold[s] its own in London's river front." (Wikipedia)