Minecraft wiki entry for Beacon, associated text: Pyramids are the structures required to activate beacons. There are four possible pyramid heights. More pyramid levels make more powers available in a wider affected vicinity. The type of mineral block used to build the pyramid is entirely cosmetic and has no functional effect. Several different block types can be mixed without affecting functionality. If the pyramid is damaged so that the beacon deactivates, the previously-set powers resume their effects upon reactivation when the pyramid is repaired. This applies to piston-altered pyramids as well.