So (I wasn't around, more veteran voices can correct me), for the first key, the fragment was scraps of paper which were pieced to make a recipe. For the second key, the fragments were tiles that fit together in a certain configuration to make the Tetrahedron. This third key are constellations - how do constellations fit together? Contiguous portions of sky? A way to navigate to a destination? To ascribe personality traits to people born in different months of the year? How else are constellations used?