Minecraft wiki entry for Shelters, associated text: The cornucopia is probably one of the most simple "structures" on this list. It basically consists of a storage area where anyone can give away and take any item for free, and can range from a single chest or barrel located off a main road to an elaborate structure of stacked double chests in a central square. Rules are optional but recommended; basic rules include prohibiting taking everything from the cornucopia, requiring each player to give an item of similar or greater quantity, value, or purpose to what they have taken (such as exchanging cooked cod for cooked rabbit, or potions for miscellaneous potion ingredients), only giving and taking what a player actually needs, or limiting what is allowed in the cornucopia (such as prohibiting tools of iron and better, or limiting food to a stack of 16).