Consider the following two statements:
1) Things fall downwards, and anyone who disagrees is objectively wrong.
2) Mozart is better than Iron Maiden, and anyone who disagrees is objectively wrong.
I think there are problems with the second statement, and not just that people will stop inviting you to parties. You're trying to impose your opinions on other people.
There are approaches you could take to determine which art is objectively better. For designing a website, the answer is which gets more hits, or sells more products. But as far as art goes... you could take a democratic vote over which artist is better. You could, in a thought experiment, extend the vote to a sum over the whole of mindspace. You could weight by IQ.
But I don't want my tastes in art to be determined by a democratic vote of what everyone else thinks. At the end of the day, the people who say "there's no best way to do it" are not able to work out what the most popular website ever would look like, and saying that the currently most popular site is objectively best would stifle innovation.
They're not trying to say philosophically universally correct points. They're not theologians trying to determine whether God could create the perfect painting. They're trying to teach humans.
But as far as art goes... you could take a democratic vote over which artist is better.
I think the most direct way to do it would be to measure people's brain activity. I'd be skeptical of self reporting. I think people would be swayed a lot by what they think they should like. I'm pretty sure I've read some research on this but can't recall what it was :/
But I don't want my tastes in art to be determined by a democratic vote of what everyone else thinks.
It wouldn't be. In this case "best way" would be defined as something along the lines of maximizing total happiness.
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