Carrying 800 passengers and their household goods, agricultural animals, and farm-related supplies to Earth’s first interstellar colony, starship Origen’s hyperdrive self-destructs, marooning its passengers near an Earth-twin planet orbiting an unknown solar-twin star. While settling in, the inadvertent colonists name their world Valeron, and discover that Valeron is scattered with hundreds of thousands of alien replicator machines—but there are no aliens nor any other trace of them.
Each replicator is a shallow 8-foot-wide black stone-like bowl half-full of fine silver dust. Beside the bowl are two waist-high pillars about 8 inches in diameter, one pale silver, the other pale gold. Tap on either pillar, and the pillar makes a sound like a drum, one pillar high, the other low. Tap 256 times on the pillars in any sequence, and something surfaces in the bowl of dust. Simple sequences create simple and useful things like shovels, knives, rope, saws, lamps, glue and much else. Complex or random sequences create strangely shaped forms of silver-gray metal with no obvious use. 256 taps on the pillars can create any of 2E256 different things; in scientific notation, 1.16 X 10E77.