The Dayshift at Freddy's Trilogy is a MASTERPIECE(contains spoilers for all 3 games)
If you are looking for a specific physical "piece" within the game's mechanics:
: One of the most famous items in the game's lore is the device Dave Miller builds. Humorously, he claims he can create a soul-tracking device using nothing but a Geiger counter, tinfoil, and an old sock . Post-Day Mini-Games
