One of my early mentors worked on it. They mentioned the pulsation for the sleep indicator was modeled not just on the human respiratory rate, but specifically that of a sleeping adult. It came up when we were playing around with on/off dimming curves for a room based video conferencing product and discussing physical analogies we could model a curve on. Fun afternoon exploration, but in the end we just stuck with ease-in/out. I miss when you didn’t need to overly justify taking an afternoon detour to explore whether something could be improved.

It could absolutely be false nostalgia since I was a Mac fan from about 2005 to 2009 with an MBP that had the breathing feature but this really felt like a high point for computer hardware. It felt slick and performant but still serviceable.

Ironically, after a series of uninspiring Windows machines the next laptop that made me feel any level of enthusiasm like that Mac is my current Framework 13 running COSMIC on NixOS. Quite an about face!

That light was a big deal - I remember when I got into Arduino years ago this was one of the common projects people would do to add a breathing LED to everything, including a pumpkin:

https://www.evilmadscientist.com/2010/a-pumpkin-that-sleeps-...

I think the sleep light on the white plastic iBook was the first product feature I truly loved. My greatest hope is that I should be so lucky as to invent a single thing as great over the course of my lifetime.

This someone jogged a memory of an all-time favorite line from a 2005 laptop review (well, more of a rant than a review): https://web.archive.org/web/20090709072628/https://arstechni...

> [The power] light informs the user that the X41 is on—no, really. There should be an ontological indicator next to it to let the user know the computer really exists.

The dot in the "i" in "Thinkpad" on my laptop's lid does this, copying the mac, I expect. It's red, mimicking the trackpoint.

The sleeping light - because what all hardware requires is blindingly bright LEDs that are always on. Even when that hardware is asleep

The Macbook battery indicator that's mentioned in the article, was so very good.

This is a neat article.

I don’t think I ever thought much about that light but now after reading this article…it really was a pretty cool and useful detail.

The info about how the light’s rhythm was meant to be similar to human breathing is cool too.

That last ~gif~ mov really looks like a sleeping robot from a Pixar movie.

I think all my laptops' LEDs first blink wildly when I close them, then change to a slower rhythm, that's not an Apple feature.