# Dimensional decoupling

post by brianlui · 2018-05-19T15:26:49.996Z · score: 10 (7 votes) · LW · GW · 15 comments

## Contents

```    Inversion
Dimensional decoupling
Inversion asks, “what if something was the opposite?”
Dimensional decoupling asks, “what if something wasn’t an opposite?”
How it works
Some examples
Don’t do this though
Try it out yourself!
None
```

This is also posted at brianlui.dog.

Cornelius has a problem in his life.

Cornelius: Emma, I know you’re really good with people. I feel silly saying this, but maybe you could help me with a problem I have?

Emma: That’s a very nice thing for you to say, Cornelius! What’s the matter?

Cornelius: I keep getting taken advantage of! A lot of my friends seem like they’re really nice, but they just take and take from me and never give anything in return. I noticed that your friends aren’t like that at all. What am I doing wrong?

Emma: I’ve met a few of your friends and I have to agree. A lot of them seem like they’re nice, but I completely expect them to take advantage of you.

Cornelius: How can you tell?

Emma: Well, it’s hard to explain in words. But I just read on my favorite blog site, brianlui.dog, about a new skill that teaches you how to understand it! Here’s how it works…

Inversion

Carl Jacobi famously recommended us to “invert, always invert.” Paul Arden wrote, “Whatever you think, think the opposite.” Peter Thiel questions whether “there’s a point where no corruption can be a bad thing.”

Inversion is a powerful mode of thinking, albeit with some drawbacks. Pre-mortems are an example of a systematic application of inversion. Charlie Munger, the right hand man to Warren Buffett and also a billionaire, is fond of quoting Jacobi’s maxim:

“Turn a situation or problem upside down. Look at it backward. What happens if all our plans go wrong? Where don't we want to go, and how do you get there? Instead of looking for success, make a list of how to fail instead - through sloth, envy, resentment, self-pity, entitlement, all the mental habits of self-defeat. Avoid these qualities and you will succeed. Tell me where I'm going to die, that is, so I don't go there.”

On the other hand, Peter Thiel was criticized for applying the inversion concept too aggressively, with headlines like “11 Head-Exploding Quotes From Peter Thiel's Bonkers New York Times Interview.” Inversion is a powerful tool, but can make us look unnecessarily contrarian if we apply it in the wrong contexts.

Coming back to Cornelius’ problem with his friends taking advantage of him, maybe Cornelius could apply the inversion principle. But this only leads to thoughts like “What if the friends who take advantage of me were actually nice?” or “What if I look for mean friends instead?” Not very useful!

We need a skill that is even more powerful than inversion, and this skill is dimensional decoupling.

Dimensional decoupling

Dimensional decoupling applies the concept of decoupling in a dimensional way.

A dimension is an attribute along which something can vary. For example, something in three-dimensional space can have a length, width, and height, which are three dimensions. A database of inventory at a supermarket might have price, size, expiry date, and probably additional dimensions. Decoupling means separating something that is usually viewed on a single dimension into two dimensions.

The heart of dimensional decoupling and how it builds upon inversion is this:

## Dimensional decoupling asks, “what if something wasn’t an opposite?”

This is extremely generative. Our creativity skyrockets as we learn that most of the things we assume must go together can be separated. Our analytical power and logical reasoning improve in lockstep, as we process all of the possibilities that open up.

It is also more dangerous; if we invert something that shouldn’t be inverted, we lower our prestige and status by being too theoretical and annoying. An incorrect use of dimensional decoupling can make us seem unhinged and crazy. It can even cause us to actually become more crazy, because we are disassociating concepts that shouldn’t be disassociated! Fortunately, we can easily learn how to use this skill wisely and safely.

How it works

Cornelius was upset because his “nice” friends took advantage of him. We’ll help him out with dimensional decoupling.

Here is Cornelius’ view of his friends:

Cornelius sees his friends as either nice people who help him, or selfish people who take advantage of him. He seeks out people who are nice, and befriends them. At the same time, he avoids mean people.

This is a bit too simplistic. We can connect these two by putting them onto an axis, with “nice” at one end and “selfish” at the other. By doing this, we are claiming that people are not 100% nice or 100% selfish; they can be partly nice and partly selfish.

Someone can be selfish, but still nicer than another person who is even more selfish. Cornelius knows this already, though - he prefers friends in proportion to how nice they are. Now comes the key step in this technique: we dimensionally decouple them by seeing “nice” and “selfish” as two separate dimensions. As two separate dimensions, they each have their own axis:

We’ve now successfully decoupled these concepts! Mean–nice is its own axis, and generous–selfish is its own axis. There are now four possibilities –

· Nice and generous (what Cornelius thinks of as “nice”)

· Mean and selfish (what Cornelius thinks of as “mean”)

· Mean and generous (people that could help Cornelius, if only he didn’t avoid them)

· Nice and selfish (people that take advantage of Cornelius)

Our dimensional decoupling reveals to Cornelius the categories of “mean and generous” and “nice and selfish”, which he previously couldn’t see because he had the similar concepts of “nice” and “generous” coupled together.

Cornelius: Emma, I understand where I went wrong. I thought that nice people were generous, and that mean people were selfish. You were looking for whether people were generous or selfish, while I was looking for whether people were nice or mean. That’s why I kept getting hurt by the selfish people!

Emma: Yes, you’re right. And this technique can be used for so many other things, too…

Some examples

Cornelius’ problem was that he thought that niceness was the same as generosity. Dimensional decoupling is an effective way of showing this to Cornelius. Although we may know that niceness and generosity are different things, this is not immediately obvious to everyone! In fact, one of the reasons that dimensional decoupling is so effective is that it can take entangled concepts and separate them forcefully and compellingly. Any time that we feel something is “not quite right” but can’t put our finger on it, we should use dimensional decoupling on the areas that feel wrong. Chances are that we will quickly find out which of our assumptions are wrong.

Here are some more examples of dimensional decoupling in practice, to show its power and versatility.

This is an easy application of dimensional decoupling. We intuitively know that being busy doesn’t mean we’re being productive, but it’s easy to lose sight of why.

There are entire websites dedicated to minimizing the impact of our biases. The assumption here is that the more biased we are, the less accurate we become. But is that really right?

A lot of advice for dealing with the negatives of sadness focus on creating more happiness. Buried in this assumption is that being happy means we won’t be sad. Dimensional decoupling shows the flaw here: we can easily think of many times when we were neither happy nor sad, and also times when we were both happy and sad. All of the more nuanced feelings that make up the human experience contain both happiness and sadness – think of melancholy, bittersweet feelings, wistfulness, love.

Don’t do this though

Here are two examples of applying it wrongly. Be careful!

It would be embarrassing to say “Bach is best appreciated when played at a loud, low volume.”

A cat-dog? What is even the use of this classification?

Try it out yourself!

Dimensional decoupling becomes more useful as the two concepts are either more similar or more opposite, because greater similarity means that we’re more likely to assume they are entwined. “Sad” and “happy” are closely related, so decoupling them is very useful. On the other hand, something like “cat” and “dog” wouldn’t be useful to decouple, because no one would think of them as being opposites in the first place!

Another pitfall is that it doesn’t work if we try to decouple concepts that are identical. “Loud” and “high volume” are so similar that we will sound crazy if we go around saying “the loudness of this music is unrelated to the volume it’s played at.” Here is a visual representation:

We don’t want to be in the red zone at the top, but we want to get as much blue as possible. The most valuable decouplings are the ones which are really similar, but not identical. How close to the knife edge do you want to be?

comment by Said Achmiz (SaidAchmiz) · 2018-05-19T23:00:04.900Z · score: 12 (3 votes) · LW · GW

This post seems to be pointing at something interesting and useful, but it seems to me that (apart from any criticisms such as this one [LW · GW]) the main problem is that you don’t actually tell us how to do dimensional decoupling!

Yes, in a case where we already know that concept X actually decomposes into two orthogonal concepts Y and Z[1], then we can go ahead and draw the graph, identify what point we want to occupy, and proceed thereto with all haste. But isn’t the whole problem that we often don’t know that some concept X which we are using may be usefully decomposed—and that even if we do consider the possibility, we still do not know what orthogonal concepts Y and Z (if any!) our concept X decomposes into?

So I think the meat of this technique is missing; were it present, it would provide us with a systematic way of answering these two questions:

1. How do we identify situations where we are using some concept which may be usefully decoupled? Or, alternatively: which of our concepts in fact constitute couplings of two (or more?!) orthogonal[2] concepts—and how do we tell?

2. Having identified a concept which is, in fact, a coupling, just how do we decouple it? Ok, so we have some concept X which we have (somehow) decided may be decoupled into two (or more!) orthogonal concepts Y and Z. Now, how do we identify Y and Z? (And how do we verify that Y plus Z is, in fact, what we originally thought of as X?)

[1] Where either Y or Z may have the same label as the label we were using for X.

[2] Note that some pairs { Y, Z } in such situations may not be entirely orthogonal, i.e. there may be a systematic (perhaps because causal) correlation between them. For example, is niceness correlated with generosity? To my naive intuition, it seems plausible that there should be some non-zero correlation. Answering this sort of question seems to me to be critical to any attempt at “decoupling”, lest we delude ourselves into imagining a world where all points on the supposed (Y,Z) plane are available for occupancy, when in fact nothing like that may be true at all.

comment by brianlui · 2018-05-20T00:59:41.912Z · score: 6 (2 votes) · LW · GW
How do we identify situations where we are using some concept which may be usefully decoupled? Or, alternatively: which of our concepts in fact constitute couplings of two (or more?!) orthogonal[2] concepts—and how do we tell?

Great catch. This is something I didn't mention in the article because I typical-minded. Here's a description, which I will add back to the article later probably:

1. Whenever you come across something that seems like it is logical, but violates your intuitions, then there's a high chance that this technique can help. This is an easy situation to use dimensional decoupling and it comes naturally, because we are already in 'interrogative' mode.

2. When you're stuck on a problem, go through your assumptions and try to decouple them one by one. Often you will find that some assumptions can be decoupled and then one of the resulting parts can be relaxed. This is relatively harder and needs practice, because it's not natural to examine our assumptions like this.

Having identified a concept which is, in fact, a coupling, just how do we decouple it? Ok, so we have some concept X which we have (somehow) decided may be decoupled into two (or more!) orthogonal concepts Y and Z. Now, how do we identify Y and Z? (And how do we verify that Y plus Z is, in fact, what we originally thought of as X?)

I believe that the hard work is in identifying the object that needs decoupling. Once it's identified, the decoupling method is relatively simpler.

1. The easiest one is with opposites. Happy vs sad, masculine vs feminine, straight vs gay. These are really easy to decouple. To verify them, we just see whether the two new "corners" make sense. E.g. Is it possible for someone to be interested same-sex and opposite-sex people simultaneously? Is it possible for someone to be interested in neither? Y and Z are just the two poles of the spectrum.

2. For non-opposites, make them into poles. Bias vs accuracy. Bias is one pole, so the other pole is "unbiased". Accurate is one pole, so the other pole is "inaccurate". To verify them, again we see whether the two new "corners" make sense.

Note that some pairs { Y, Z } in such situations may not be entirely orthogonal, i.e. there may be a systematic(perhaps because causal) correlation between them.

Yes! They are almost certainly correlated - that's the entire reason that they are so often seen as entwined. Counterintuitively, higher correlations are often more valuable to decouple. On the last graph, we can also think of it in terms of correlations:

1.0 correlation - this is the 'red zone' where we say crazy things like "loud isn't high volume". The correlation is so high that they shouldn't be decoupled.

0.5-0.9 correlation (roughly) - this is the valuable area. The high correlations means that the two concepts frequently go together. But in the situations where they differ, it's super easy to miss.

0.0-0.5 correlation (roughly) - this is not as valuable. Because the correlation is low, it means that we wouldn't naturally think of them as going together. Therefore, there is low risk that we are incorrectly coupling them.

comment by clone of saturn · 2018-05-19T21:26:21.462Z · score: 10 (2 votes) · LW · GW

The most valuable decouplings are the ones which are really similar, but not identical.

It seems like the most valuable decouplings would actually be the ones we think are similar or identical, but turn out not to be.

Also, how is this concept different from bucket errors [LW · GW]?

comment by brianlui · 2018-05-19T23:03:48.348Z · score: 11 (3 votes) · LW · GW

You're right, bucket errors are the result of entwining things. Dimensional decoupling is a way of reducing bucket errors. In my personal experience, once I used dimensional decoupling regularly, it became second nature and automatic. I think it's important to have low-friction ways of reducing bucket errors.

And yes, the most valuable decouplings are ones where they aren't identical but we think they are. But until we try to decouple them, we don't know whether they are or not!

comment by CronoDAS · 2018-05-24T14:03:04.806Z · score: 7 (2 votes) · LW · GW

A cat-dog? What is even the use of this classification?

Challenge Accepted! ;)

https://youtu.be/OztGJhiBQTo

comment by TAG · 2018-05-20T08:15:40.832Z · score: 7 (2 votes) · LW · GW

Can dimensional decoupling fail?

comment by brianlui · 2018-05-21T09:50:16.224Z · score: 6 (2 votes) · LW · GW

Yes, the failure modes are mentioned in the last part of the post: trying to decouple identical things, and trying to decouple unrelated things.

comment by deluks917 · 2018-05-19T18:36:49.873Z · score: 7 (2 votes) · LW · GW

Great post. Decoupling nice/generous is extremely useful. Lots of people look for signs of being 'nice' when they really want someone generous.

comment by Said Achmiz (SaidAchmiz) · 2018-05-19T23:02:36.438Z · score: 6 (1 votes) · LW · GW

Unrelatedly to my other comment: I don’t understand what is being depicted on the last chart. What is the horizontal axis? What is the blue gradient? What are the call-outs referring to…?

comment by Dacyn · 2018-05-20T12:39:02.721Z · score: 4 (1 votes) · LW · GW

The Cornelius/Emma anecdote seems like a red herring... my impression of Cornelius isn't that he was having a hard time making a conceptual distinction between "seems nice" and "is likely to take advantage of me", he just didn't know how to measure the latter...

comment by Elo · 2018-05-19T22:39:04.827Z · score: 1 (2 votes) · LW · GW

Diagrams disagree with each other and don't seem to follow a pattern.

Should exist on that diagram.

comment by Said Achmiz (SaidAchmiz) · 2018-05-19T23:01:03.604Z · score: 6 (1 votes) · LW · GW

For what it’s worth, the diagrams look fine to me. I didn’t spot any see any inconsistencies, (though I may’ve missed something). Certainly the happy/sad diagram looks just fine.

comment by brianlui · 2018-05-19T22:59:46.017Z · score: 5 (2 votes) · LW · GW

Which diagrams disagree?

The pattern is an application of dimensional decoupling - the dimensions are the in the headers of the diagrams.

Top left: sad and not happy.

Bottom left: not happy and not sad.

Bottom right: happy and not sad.

comment by Elo · 2018-05-20T03:36:34.853Z · score: 1 (2 votes) · LW · GW

are the points:

A, 0 || A, not B
Not A, B || B, 0

Or:

A, not B || A, B
Not A, Not B || not A, B

?

comment by brianlui · 2018-05-21T09:52:13.708Z · score: 2 (1 votes) · LW · GW

The latter one. It follows the same pattern as this diagram.