Its an outline of a human skeleton with the right hand leaning on a wall and the left hand on its hip. it was unfinished and a version with shadows and lighting was lost :( you are welcome to take this furter 人間 スケルトン 頭蓋骨 人間 Skeleton(Outline)
A diagram showing back and side views of the human skeleton, circa 1900. (Photo by Hulton Archive/Getty Images) 白の背景 解剖学 人間の表現 Human Skeletons