Minecraft wiki entry for Iron_golem_farming, associated text: A village center is the northwest bottom corner of a point-of-interest (POI) block, which can be a bed pillow, bell, or workstation. The village center always begins as the pillow of the first bed linked to a villager. It can shift when a villager links to a new POI or unlinks from a POI after three failed attempts to pathfind to it, or after removal of either the villager or the POI from the village. The game attempts to make the village center correspond roughly to the geometric center of all linked POI in a village, but there is randomness involved and shifts can seem erratic.