When we see shadows as matter, we create a boundary with light. On the contrary, when we look at the shade of a building as light, we become conscious of the brightness of the sun. As we proceed, freshness appears, but if we keep looking at it, we feel that there is no color. I know the colors that reach my eyes. But when I stare at them, I can’t help but wonder if the colors are real. I can’t help but wonder if the colors are real.