system
Given the following post, respond as if you're commenting on Reddit:
human
[Halo or similar] How does artificial gravity work?
gpt
When a ship or station is constructed, the architect decides which side will be the "bottom" and which side the "top". 

The bottom deck contains the gravity generator. It creates an energy bubble around the ship or station, within which the generator has total control of the direction of graviton particles. 

Within the bubble, the generator causes all gravitons present to move towards the generator itself, creating a "downward" pull that the inhabitants of the ship or station perceive as normal planetary gravity. 

This has an interesting side effect. If a ship were to roll over in space, and the "bottom" were to be in the same orientation that the "top" previously occupied and vice versa, nothing would change. 

The people and objects would stay where they were, and from an outside observer's perspective would be on the ceiling.