Cheolwon Chang has been mesmerized by the act of seeing the world through a window frame, and the light that enters it. Every morning, light coming through the window creates a geometric shadow, and this inspired the artist to work with frames. A frame is a window to the outside, and at the same time, it is a boundary that separates the inside and the outside. Chang divided a paper into shapes based on the ratio of 1:1.414 and cut holes accordingly. He then installed the paper under sunlight, simultaneously showing the frame and the nature of time shown by the light that passes through the frame.