3-sphere two 3-balls. This construction is analogous to a construction of a 2-sphere, performed by gluing the boundaries of a pair of disks. A disk is a 2-ball, and the boundary of a disk is a circle (a 1-sphere). Let a pair of disks be of the same diameter. Superpose them and glue corresponding points on their boundaries. Again one may think of the third dimension as temperature. Likewise, we may inflate the 2-sphere, moving the pair of disks to become the northern and southern hemispheres. After removing a single point from the 2-sphere, what remains is homeomorphic to the Euclidean
Sphere of annihilation "sphere of annihilation" remains in place, but a character can move it through mental effort. Mordicai Knode of Tor.com called the item "the best minor artifact" in the game. Sphere of annihilation A sphere of annihilation is a fictional magic item in the "Dungeons & Dragons" fantasy role-playing game. The sphere of annihilation appeared in first edition "Advanced Dungeons & Dragons" in the original 1979 "Dungeon Master's Guide". It also appeared in second edition "Advanced Dungeons & Dragons" in the 2nd edition "Dungeon Master's Guide" (1989). The sphere of annihilation appeared in the third edition "Dungeon Master's Guide" (2000), classified