system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: Why is it that when you have motion sickness in a car/bus, looking outside somewhere far away makes you feel better?

I know motion sickness is the failure of your brain and eyes to sync in motion. But staring at something far away (which would seem like it's not moving), isn't that the same as not looking out at all?   
However when I look at moving objects, passing trees etc, it makes me want to throw up immediately.
gpt
Motion sickness is caused by your inner ear and eyes sending conflicting information to your brain. Your brain then thinks you're hallucinating, which means you might have ingested poison, and you need to expel it. So you get nauseous. 
People can get motion sick on/in vehicles because they move with the vehicle. Imagine you're in a closed room on a ship in rough seas. Your inner ear perceives you going up and down on the waves, which could be huge movements, but you are barely moving at all in relation to your surroundings (the room). That confuses your brain. If you're on the deck and staring at the horizon, the tiny movements of your eyes tracking it as you move will match up more closely to your inner ear's signals, which can help you not become sick. Closing your eyes can also help, as it removes the conflict in signals, but but it has issues in movement while your eyes are closed, which can be easily perceived as danger by the brain.