- Gesture serves vital domains in life, including social, cognitive and physical communication. 

- Approximately 60–65% of social meaning is derived from nonverbal behaviours. 

- As technology enables new ways to communicate, people spend more time interacting with hands mailing, messaging and exploring social networking. 

- Advantages of tangible user interface over graphic user interface are:

         (1) enable physical interaction
         (2) provide rich feedback and
         (3) produce high-level of realism [18].