Also known as the Bends o' the Rainbow or the Wizard's Rainbow, these are thirteen magical glass balls - one for each Guardian and one for the Dark Tower itself. Some look into the future, others into the past or alternative realities, and some can act as doorways between worlds. All are alive, hungry, and corruptions of the pure energy of the White, representing the baser emotions of a fallen world. The most terrible is Black Thirteen, which can send its victims to all nineteen points of nowhere. When Roland was young, only three or four were believed to still exist.