Minecraft wiki entry for Shulker_farming, associated text: There are two main approaches to shulker farming, cell-based designs, and reactors. Cell based designs maintain a shulker in a breeding cell, removing the duplicated shulkers from around the breeding cell as quickly as possible. On the other hand, reactors rely on having a large number of effective breeding cells, and just let the number of shulkers naturally saturate, collecting drops from within the reactor as shulkers gradualy die off. Both designs have their strengths and weaknesses, with reactors tending to be a lot simpler, but being larger, and usually requiring significantly more blocks placed for the same rates. In both cases, these farms are reliant on having a large number of teleportable spaces for the breeding shulker(s). However cell-based farms also need a way of moving shulkers away from the region around the breeding shulker.