Concave Slot

are in .
==Location and Uses==
Usually found within , are large, glowing, bowl-shaped divots in the floor with a small or large slot at the center, serving as a receptacle for an , one of which is usually somewhere nearby. They are covered in iconography, and act as to activate various mechanisms, such as doors in . Because of the 's bowl shape, an can easily roll down into it when tossed from a distance.
 are sometimes found in the of . These are embedded into , and by inserting an into them, an will emerge from the ground nearby.
==Nomenclature==