This is the series of paper that I uses to create the marks as a reference for my artwork. I'd folded the paper again and again, then, rub it with charcoal to see how the mark has been made. Some of the details trace back to those of a human body. Veins, crease and wrinkles. With disastrously paper, the surface is not entirely flat. Shadows has been casted to intensified  the depth of each piece.