system
Given the following post, respond as if you're commenting on Reddit:
human
[Various] How are ancient tombs / monuments lubricated?

So I'm in this ancient tomb and I deciphered its grand secrets (specifically, putting this round artifact looking thing into the round hole looking thing on that door looking thing). Now all the walls are moving around and a stairway leading down to a big chamber full of treasures has opened up on the floor. That's all well and good (anybody want some treasure?), but hold on just a minute. How the Hell did these giant, presumably extremely heavy stone walls move so easily? What crazy mythical grease can last centuries and still be perfectly functional?
gpt
The mechanisms don't rely on lubricated plane-on-plane contact. Instead, they rely on massive counterweights and stone ball bearings the size of cannonballs.

This is why you always hear that horrible grinding noise.