Non-overlapping magesteria

[Thumpalumpacus]

Art must have goals and those goals can be measured. For example, some music is designed to be relaxing. Other music is designed to be cathartic. The "Piss Christ" was designed to communicate the artist's feelings about Christianity (I assume). ( http://en.wikipedia.org/wiki/Piss_Christ )

And what of art created solely to express the artist's inner feelings? How do you measure that?

Science can measure the wavelengths of the golds in Wheat Field with Crows -- but can it take measure of the desperation of a suicidal artist?

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Yes.

In principle, one could trace the entire detailed evolutionary history of the perception of beauty, and the environmental influences upon the individuals at the end of the evolution, and thus identify how and why of every instances of perception of beauty scientifically.

I disagree. Demonstrate your point.