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@astronomerritt Hey, that's awesome! Now there's a great use for stereoscopic 3D.

@astronomerritt Ooh, fascinating! Thanks for responding. How did you come to start getting it?

My grandfather was blind in one eye from 12, but you never would have known it; he just lived his life. My understanding was that it was more a field-of-view problem for him than anything involving depth perception.

You can try it now yourself. Close one eye and go get a snack or a book from the shelf. How much does binocular vision matter at 1 foot, 10 feet, 30 feet? /15

Here we move from history to speculation, but I think the real reason this doesn't matter is that humans are extremely good at reconstructing mental 3D from visual 2D.

It doesn't appear to be well studied, but human binocular vision mainly works well up close, and peters out around 50 feet.

But anybody can look out a window and have a decent 3D model in their heads extending out hundreds, even thousands of feet. 14/

My objection is that otherwise smart people, over and over and over again, make big investments in that hypothesis without ever understanding why it has failed so many times before. Facebook's VR losses alone are above $75 billion dollars.

Stereoscopic 3D is a cool novelty, but at this point I'd be amazed if anything serious ever comes out of it. And if it does, it will be because somebody really looked at the failures and pursues products people actually care about. Because so far, every time, people get bored and quietly go back to the thing that was already working for them. 13/

My point here isn't "3D bad". It's that for 175 years or more, people have been thinking "2D success + stereoscopic 3D technology = the future".

It's not a dumb hypothesis, really. People do process (a relatively close portion of) the world with binocular vision. Seems possibly important. 12/

Now as people have already pointed out, stereoscopic 3D has never been totally dead. Look, for example, at this graph of the proportion of movies in 3D. It's kept bumping along. https://stephenfollows.com/p/how-are-3d-movies-performing-at-the-box-office 11/

This era is clearly in retreat with mass Meta layoffs and killing products that were, only a few years ago, the future of both Meta and the world: https://www.theverge.com/tech/863209/meta-has-discontinued-its-metaverse-for-work-too
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I'd put the peak of this era in 2021, when Mark Zuckerberg renamed Facebook to Meta, because a VR universe, the metaverse, was the future of both play and work. 9/

But the big new future that came out of 3D movies was virtual reality, round 2. Starting in 2010 or so there were many stabs at this, all funded by rafts of ZIRP investor money. 8/

With 3D movies back in fashion, electronics manufacturers wasted no time taking the obvious next step: 3D TV. One CES these were everywhere, and the next one they weren't. 7/

We then needed 20 years to forget about that before the next 3D future arrived: Movies! Again! This one ran circa 2009-2013. As we know it ultimately didn't pan out, but it was enough to touch off two more fads involving stereoscopic 3D. 6/

The crash of that was enough to get people to forget about stereoscopic 3D for a generation. But in the 1990s as personal computers became ubiquitous and the early Internet created excitement, computers became powerful enough to render 3D graphics in real time. Rendering 3D worlds on 2D monitors was wildly popular, but interactive stereoscopic 3D was seen as the future of fun. And also of work! 5/

Then in 1952-1954 came the future of movies: anaglyph (aka red/blue) 3D. 4/

By the 1940s, thanks to amazing technical advances, the future arrived not just for postcards but for education. The US military bought 100,000 viewers and 6 million reels to educate soldiers and sailors. 3/

There was another wave of 3D during the rise of coin-operated machinery. Here, a device from 1905. 2/

In honor of Meta's latest announcement, a thread on 175 years of 3D failure.

Let's first go all the way back to 1851 with the Brewster Stereoscope. No less a person than Queen Victoria was impressed, kicking off a fad that quickly sold over 250,000 units. Turns out it was not the future of photography.

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