"Kulak" was Russian for "fist." In this context it denoted an irregular lump of nickel-iron some thirty kilometers across. A hundred and fifty years ago, Red had moved it from the Kamchatka boneyard to a position above the Makassar Strait, where it had orbited ever since. Like a loosely clenched fist, it had a cavity down the middle, a tunnel now presumed to be lined with rotating habitats. Red’s answer to the Great Chain.