The Creator of Naruto wanted to show that he had two personalities, making have two faces, causing him to quarrel with himself.
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cone
light face and dark face.Actually it is phase not face. They are light reaction and dark reatcion
The intersection of two or more solids can either be an empty set, a point (two cones "intersecting" apex-to-apex), a line (two cubes touching along one edge), a face (two cubes, face-to-face). If the solids are "filled", the overlapping intersection will be another solid. If they are hollow, it will be a closed three dimensional figure.
pages 56 and 57