Minecraft wiki entry for Egg_farming, associated text: Once the walls are set up, it is easiest to build the egg room from above. Make sure to offset the room so the input hopper is in the center of the floor, and light the egg room properly. When orienting the room, think about where you want the access tunnel to go. As shown, an access corridor leading to the lower left of the diagram allows getting at all the containers and both switches.