Demo 1. An impossible pair of objects made after Sugihara's (2005; 2014) “Four Perches and a Ring”. One of the objects is a planar, blue ring. The other object is composed of an octagonal truncated-cone and two apparently hexagonal-cones. This object does not have any rectangular corners or any rectangular faces. The objects can be rotated by dragging the mouse over the image of the objects. Show the ring: