Invited by government, we designed this installation presenting salt crystals which is the main economical product for Budai county in Taiwan. The salt crystals are polygonal in shape, so we design the polygon, at two special angles allowing the triangular surfaces to reunited, is with wood to create an outer contour and an inner structure interacting with the wind, giving the whole piece not only an image of salt crystals, but also a sense of the importance of natural elements to the salt industry. When the sea breeze blows, it rotates chasing the light and the shadow of Budai.