The Eye of Ender (or Ender Eye) is a craftable item used to locate and activate End Portals. Eyes can be used to activate End Portals by being placed into empty End Portal Frames until the entire ring of 12 frames is filled, thereby activating the End Portal. They are used as an aid in finding the End Portal by leading the player to an End Portal Frame inside of a Stronghold by right-clicking while it is in your hand, which will throw the Eye of Ender in the direction of the closest End Portal Frame. Eyes of Ender are also used in the crafting of an Ender Chest. The Eye of Ender resembles a cat's eye with a constricted pupil.