Memory obelisks are ancient manufactured devices used for extracting and storing memories. The most popular models, made by FlimFlamCo., resemble small black pyramids encasing a blue crystal.
No pony inquired as to how the devices worked, most assuming it was a simple spell matrix like those on saddle cannons or household appliances. The truth was more sinister. Evening Dew reveals to Lozenge that each obelisk contains a spirit forced to relive the remembered moments over and over, slowly losing their ability to tell between themselves and the ponies' lives they inhabit.