The Projection Layers are the "life system" used in the game Psychonauts.
Projection layers are a series of protective barriers that protect the subconscious entity while within a person's mind. Should the entity lose all their Mental Health while within the mind, one projection layer will be lost in order to preserve the safety of the mind dweller.
Should Razputin Aquato lose all his projection layers, he will be kicked out of the level automatically. If all projection layers are lost while in the real world, he will be taken to the nearest hub world.
Rasputin can restore a layer of his astral projection by collecting Astral Layers. He can also permanently increase the maximum amount of projection layers he can have by collecting Golden Helmets which increase the amount of layers by one.