Su-song

A chinese polymathic scientist, excellent in various subjects like mathemetics,astronomy,cartography,geogrphy,horology,pharmacology,mineralogy,metallurgy,zoology,botany,mechanical engineering,hydraulic engineering,civil engineering,architecture,invention,art,poetry,philosphy,antiquities. and stateman during Song dynasty. He made clock tower. 

In this tower, 

1. we can see specific building with turret clock and have one or more clock faces.

 2.Many other clock towers are freestanding structures but they can also adjoin or located on the top of another building.other building have clock faces but they have some other functions. 

3.clock owers are common sight in many parts with some iconic buildings. 

4.The mechanism inside the tower is known as a turret clock. 

It often marks the hour (and sometimes segments of an hour) by sounding large bells or chimes, sometimes playing simple musical phrases or tunes. Some clock towers were previously built as Bell towers and then had clocks added to them. As these structures fulfil the definition of a tower they can be considered to be clock towers.