The Necker cube is a cube drawing learn to do when we work Geometry. This cube has a feature very special is that it is not clear as a reference point to watch it because we do not know what are the lines drawn in front or behind the eye again we played a good move. According to the reference point or vertex to look where you distinguish one or another position of the cube. For that you upload a video quede clear aclaratiu see the cube and then try changing the references.
