The Formula of Happiness is installed at the entrance gate of Fengyuan Office, Taiwan Power Company. The door column is covered by new metal boards, which the metallic texture further addresses a sense of modern technology vocabulary. There is a machinery hand on top of the column. In this machinery hand, it holds a green plug, just in a gesture to plug-in or to unplug upon accessing to electricity. It thus responses to the curatorial concept of this public art project: “Energy, between plus and minus,” in which tells the fact that “power utilization” in between adding more and using less affects our life in the future. At night, when this office is at off hours and the iron door is closed, the transmission codes on the door seemingly has a conversation with the flowing color bar indicating the charging status of battery in the column. Such interesting look can only happen during the quiet off-hours. It is like a rainbow and reminds us that the power transmission provides us great happiness everywhere.