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Works surprisingly well, had a super sensitive passenger in the car the other day and zero signs of nausea.
One of the best and most clever "hidden" features. Very Apple.

I never get nauseous looking at my phone in an Uber anymore. My wife can barely handle looking at a screen in a car and this feature allows her to work with no issue.

This has been reposted here several times in the last few weeks, but it is a very neat feature. I find myself getting quite motion sick on the bus if I look at my phone, but these dots help me at least check messages here and there without immediately feeling like I'm going to throw up.
This is an easy enable with "Automatic Detection". Are there any other phone "Accessibility" options that are useful to everyone?
I just found out this capability is also available on Macbooks!

This would have saved me a lot of grief during a recent road trip through some mountains.

https://support.apple.com/guide/mac-help/change-motion-setti...

this helped me tremendously when I had to work in the backseat of a moving car. Felt sick pretty quick when I started using the laptop until I remembered about this feature because someone on HN recently posted / commented about it
Thank you so much for sharing this. I’ve been saying to my wife for about a year now that I wish MacBooks had the motion cues feature… turns out I just needed to search for it!
I have no idea how something like this is ideated, then prototyped, then validated, but it does work wonders for me, and I am so grateful it exists.
Seems pretty straightforward.

1. Be a developer and you (or a spouse/child/friend) get motion sickness when looking at the phone while travelling.

2. We’ve known the mechanisms of motion sickness (looking at something static while your inner ear indicates you’re moving) from before smartphones were a thing.

3. We already have a ton of information on the phone to know when we’re in a vehicle, how fast we’re moving, direction, so on.

4. Try adding something to the static screen so it moves in tandem with you and thus reduce the cause of motion sickness.

5. Get the people who get sick to try it out.

If anything, I’m surprised it took a decade and a half to come up with it.

My Android phone has this too (Vivo). Maybe they all do?

It wasn't well explained what it was for though, I discovered it while messing with the settings and thought it was just a cool random feature to visualize motion. I'm just now learning it's for motion sickness.

Honor phones have this in the quick settings (the thing that opens when you slide the right side of the top bar down), labeled "Motion Sickness". Felt well-explained and discoverable.

But the beauty and pain of Android is every brand having slightly different UI. This might well be a manufacturer-specific feature. Or maybe it's a common Android thing that some brands just expose better than others

This was invented long ago in an app, it got cloned in other apps, vendors paid attention and made it a built-in feature. Same as Swype.
This should've been possible with the Thinkpad HDAPS accelerometer back in the day. (If it detected the laptop was falling, it would park the HDD heads in anticipation of impact.) Shame nobody thought of it then!
The question I have is whether a phone with motion cues causes less nausea than no phone at all in a window-less boat.
I use this a lot on my MacBook Air when working in cabs. It’s beautiful and works well for me
I'm curious how this feature chooses to turn itself on with automatic detection.

Somehow managed to fool it the other day by shutting a car trunk, helping someone load up, with me on the outside. It activated the dots for the rest of my walk afterwards, when I was using the phone.

I get the impression there are much more sophisticated signals and classification methods to determine whether someone is in a vehicle or not, beyond the accelerometers.

I always assumed this is triggered by Bluetooth connection to the car?
I think two accelerometers would do it at different ends of the phone. Normal hand-based motion will rarely include a sustained exact acceleration in one direction on both of these at the same time e.
There was a discussion about this a few weeks ago, where I discovered KineStop which is an app that does the same on Android. I've only tried it a few times but it has worked every time.
Once this was announced a few years back, I was very skeptical that a few dots on the screen would be all that's needed to help me.

And yet, apparently it was.

It's not perfect, but the dots help me to go from instantly feeling sick to lasting 30-40 minutes before I have to stop looking at the screen.

Is this related to roll and pitch motion in sea sickness where by knowing the horizon and direction of travel can help?
Would it also work onboard a ship? Or movements are too slow to provide enough visual cues on a small screen.
In case you have a problem with the iPhone performance, make sure inside settings disable `Dynamic` pattern for this feature.

iPhone 12 Pro (26.5.2)

I like the "bubbling" dots effect that occurs in an airplane when making a turn. Anyone know the reason?

I guess they're moving in the opposite direction of the turn to force the perception of turning.

Can you play back virtual time shifted vehicle motion cues, to make yourself barf on demand? This could be a godsend for bulemics. Accessibility at its finest.
These are the type of problems that are completely invisible to someone who doesn't experience it. I wouldn't have even known it was a problem to solve.

A few years back we played an escape room game online with the whole team. One of the clues was in one of my colleagues "room". All he had to do was read it. "Come one read it man, we can win this." He froze. We all insisted he reads it. He could not read it. We thought he had an internet connection issue. Somehow we managed to escape the room and kept going.

The next day he told me he was embarrassed because he couldn't understand what we were talking about. He could not see the note we were talking about because he is colorblind.

Wonder if Tesla should add something like this to rear screen. It’s not very useful for most adults due to how low it is, but kids willing to get screen time on anything (not that I condone).