Two chips with black interiors are shown on both sides. Magically they turn from black to red, yellow, blue and green one at a time. The change is very beautiful to look at. At the end you have two chips with red on one side, blue on the other and another chip with yellow on one side and green on the other.
Demo: http://v.youku.com/v_show/id_XNTcxMTEzMDA=.html
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