Er Lake is located at the foot of a snow mountain in western China. The ecosystem of Er Lake is fragile, but it can still maintain its tranquility and mystery under the protection of the locals. When I stood by Er Lake’s side, I could see the blue water wave projected on the green stone, reflecting a turquoise light on the trestle bridge. Although I was told not to touch the lake water, I still wanted to capture the cold and colorful light it reflected. Through my design I have captured the effect of light on water, to show the tranquility and beauty of nature.