Tail (sometimes referred to as L or J) is a tetromino and predecessor of the beehive. It can often be attached to still lifes to create a larger still life (eg. tub with tail, beehive with tail). Even more important are the ways in which it may be attached to a marginally stable object of any kind to obtain overall stability while suppresing (or possibly exploiting) its own spark. The simplest such example is eater 1, in which a tail and a pre-block mutually stabilize one another. A tail can also stabilize one end of a fuse to produce a string, as in eg. fuse with two tails.