This parallels a discussion I've had numerous times in the field of computer games. I've had any number of artists / scripters / managers say that what a computer game needs is not a realistic physics engine, but a cinematic physics engine. They don't want it to be right, they want it to be pretty.

But, you'll find that "cinematic style" isn't consistent, and if you start from that basis, you won't be able to make boring, every-day events look realistic, and you'll have to add special-case patch-upon-patch and you'll never get it right in the end.... (read more)


As I understand, computer animation (as in Pixar) has built-in capabilities for the physically impossible. For example, there's no constraint in the software that solid bodies have to have constant volume -- when Ratatouille bounces around, he's changing volume all the time for extra expressiveness and dramatic effect. In that way, "cinematic" reality is simpler than realistic reality -- though of course it takes more artistry on the part of the animator to make it look good.

4AnnaSalamon11yThis is a plausible claim, but do you have concrete details, proposed mechanisms, or examples from your own or others lives to back it up? "I find that rationality makes it far easier" is a promising-sounding claim, and it'd be nice to know the causes of your belief.
7Vladimir_Nesov11yYou'll need to clarify what you mean by "non-rational goals".

The Costs of Rationality

by RobinHanson 1 min read3rd Mar 200981 comments


The word "rational" is overloaded with associations, so let me be clear: to me [here], more "rational" means better believing what is true, given one's limited info and analysis resources. 

Rationality certainly can have instrumental advantages.  There are plenty of situations where being more rational helps one achieve a wide range of goals.  In those situtations, "winnners", i.e., those who better achieve their goals, should tend to be more rational.  In such cases, we might even estimate someone's rationality by looking at his or her "residual" belief-mediated success, i.e., after explaining that success via other observable factors.

But note: we humans were designed in many ways not to be rational, because believing the truth often got in the way of achieving goals evolution had for us.  So it is important for everyone who intends to seek truth to clearly understand: rationality has costs, not only in time and effort to achieve it, but also in conflicts with other common goals.

Yes, rationality might help you win that game or argument, get promoted, or win her heart.  Or more rationality for you might hinder those outcomes.  If what you really want is love, respect, beauty, inspiration, meaning, satisfaction, or success, as commonly understood, we just cannot assure you that rationality is your best approach toward those ends.  In fact we often know it is not.

The truth may well be messy, ugly, or dispriting; knowing it make you less popular, loved, or successful.  These are actually pretty likely outcomes in many identifiable situations.  You may think you want to know the truth no matter what, but how sure can you really be of that?  Maybe you just like the heroic image of someone who wants the truth no matter what; or maybe you only really want to know the truth if it is the bright shining glory you hope for. 

Be warned; the truth just is what it is.  If just knowing the truth is not reward enough, perhaps you'd be better off not knowing.  Before you join us in this quixotic quest, ask yourself: do you really want to be generally rational, on all topics?  Or might you be better off limiting your rationality to the usual practical topics where rationality is respected and welcomed?