1. different plans
2. the lights intensity from strong to dim and different colors of lights 
Video:
This bubble wrap clan represents location A, for example, polyU.
When another person pops 1 bubble in location B(cityU), it will trigger 1 bubble in polyU to inflate and light up!
The bubbles' light intensity will change from strong to dim as time goes by, which attract passengers to play with them.
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