THE LARGEST CLOCK IN THE WORLD 

The idea began to exploit the hole above the Kingdom Tower in the city of Riyadh, without any effect to the architecture and structure design, as the Kingdom Tower along about 300 meters throughout the void while the upper 91 meters and Big Ben are the biggest and fames clock in the world and it was built on1858 at the hands of designer (Beng). As of Riyadh the capital city Saudi Arabia and the city to grow in urban area and quickly rose to an unprecedented size. The design want through many phases:

First phase: Normal clock  
-The impact on the general shape
-The impact on the structure
- Difficult day-vision
-The difficulty of vision in bad weather conditions



Second phase: digital clock
- It will influence the architectural form
- Difficulty vision of two way
- Difficult day-vision
- Difficulty in vision in bad weather conditions




The third stage: a 3D board 
- Difficult day-vision
- Difficulty in vision in bad weather conditions


Fourth stage (final): flash light
It will not effects the architectural design and the structure shape  
- The clarity of vision day and night
- The clarity of vision of both direction
- The clarity of vision in all weather conditions

Recommendations
- Detailed technical study
- Economic study
- Implementation phases
- Maintenance and operation