Spawner

Spawners are entities in The Sims 3 that permit collectible objects such as seeds, rocks, gems, metals, bugs, fish, and dig sites (in World Adventures) to appear nearby. Spawners are normally placed in various locations throughout any given world, and each have a chance of creating an object of a given type (or range of types). As spawners are unmoving and often offer a fixed set of possible objects, they serve as semi-reliable locations for collecting.