ALT A 7 step diagram of topologically squishing and stretching one figure into another. Figure 1 shows a brown ring, onto which a small structure is attached, composed of a pink ring, a green ring, and a blue cord. The brown ring passes through each of the other two rings, and they are joined to each other by the blue cord. In a series of steps, the blue cord expands to almost completely form a cylindrical tube between the pink and green rings, with just a hole in one side. Then the hole twists sideways to form a dangling hoop. Finally the cylindrical tube collapses down to just a ring, off of which the other ring dangles. The colours move along with the pieces, revealing that both the pink and green rings are still around the brown ring, it's just that the pink ring is so distorted that it stretches around both of the loops of the small structure.