It takes 1 to 10 thousand years for plastics to decompose completely, while the average life expectancy of human beings only sits at 77 to 83 years. It is impossible for us to complete the mission of counting down the half-life of plastics in our life time. Let us stand here and witness the coming of half-time of plastics with the hour hand spinning 8.76 million times. Through workshops, viewers are led to create hexagon coasters which became a part of The t1/2 final countdown on the wall of Kaigai Square.