This is a stack of color test paper for markers. We made a simple setting. When people randomly write canvas on the paper and fill the whole paper, people can choose to tear off the upper part or the lower part of the color test paper. When people tear off the paper, they will be pleasantly surprised to find that there are colorful mountains or sky on the paper, and the strokes written at random before become clouds in the sky or trees in the mountains. When people already know the existence of the sun and the sky on the color test paper, no matter how they write the painting at will, it seems to be coloring the mountain or the sky, and it seems to be intentional.