Consisting of multiple light-emitting spheres, which have a self-standing structure and are weighted at the bottom like an “Okiagari Koboshi,” or a daruma doll so as to right themselves when knocked over, and the trace of their light projected on the walls and the floor, “Optical Trajectory 2” enables viewers to touch the "movement of the colors." People can experience the “materiality of movement” as the “materiality of color movement” in space, as movements triggered by touch are synchronized with consequential changes in color. If you tilt the object, the luminosity gradually increases and the sphere becomes brighter. When you turn a sphere as if drawing an arc, as the hue of the light changes so does the color pattern on the wall.