This public art piece creating for Taiwan Power Company uses graphs to symbolize thermal power generation, hydroelectric power generation and wind-driven generator, as well as the mission of developing future energies. It also tells the fact that TPC’s mission to develop potential energies is a commitment to people’s happy life and economic growth at Taiwan. The inter-reactive effect between lights and electricity at night further brings this piece to another level of visual fun. The four panels respectively represent fire, water, wind and green energy (future energy) will automatically display lighting during night time. There are touch points with plus and minus signs by either side of these panels. Once two persons touch those touch points ";+"; and ";-"; simultaneously, the inter-reactive display mode of lighting would be turned on. They could start the lighting effect of two, three or even four panels at the same time. This is a piece of artwork inviting your friends joining together for some fun.