a large clock on the wall
The top hemisphere of the clock
The bottom hemisphere of the clock
A giant clock on the building
this is a clock 
the clock is very large 
the clock is on a building 
a round clock on a glass building 
the building's exterior is comprised of glass panels 
the clock has black hour and minute markers 
the hour and minute markers are lines 
the second, minute, and hour hands 
a clock on a building
windows on a building
a reflection in a building
the face of a clock
a clock on the side of the building
a huge clock on the side of a building