Minecraft wiki entry for Egg_farming, associated text: The static water of the design above lets some eggs get stuck on signs. Expanding the pool area (the "Flowing Egg Farm") allows a water current to gather eggs to the center, and the inward flowing current helps prevent chickens from "phasing" through the walls, allowing far more chickens to be kept. This design can be "squared off", flowing to a central 2x2 hole, or it can simply be extended horizontally, perhaps with another water current carrying eggs down the "collection corridor". It need not be the full 18 blocks wide, either, as long as the collection area is under where the currents meet.