Light gives shadow volume, shadow gives light weight, and light and shadow give life to space. Deliberately exposing the mold line in the middle, like a towering building crack, heavy and powerful. Light generate from the concrete injects temperature into the space. Up and down E27 lamp holder, convenient to replace various lamp sources. The metal replacement of structural fittings can be realized by using concrete integral pouring technology, which can reduce the cost and maintain the accuracy at the same time.