Memory tubes are tubes primarily used by the Blind Eye Society to contain the recorded memories that were taken from any witness of the supernatural after they had been removed by the memory erasing gun.
It's never specified when or how the tubes were created, but they have been in use ever since the Blind Eye Society was operational.
Whenever a person had their memory taken from them, the tubes were used to contain the memories and were then taken to the "Hall of the Forgotten," a special room where all the memory tubes containing each and every memory taken.
- The tube containing Lazy Susan's memories is labeled "(Lazy) Susan Wentworth." However, all of the other tubes seen are titled "(name)'s memories."
- However, it's entirely possible that they ran out of room.