I have no objection to someone presenting me with a painting so long as it is pretty. And I have no objection to a painting in a math class, whether it's Escher, Norman Rockwell, or Fred Gallagher. I may even be moved to make a mathematical comment about the painting.
What I would find patronizing is someone thrusting a painting at me and saying "Say something mathematical!" I think it is equally patronizing to ask an artist to saying something artistic about the Singularity or a poet to say something poetic about math. They are perfectly capable of expressing their own reactions, which may or may not - optionally, up to them - express their artistry or poetry. If you show me a painting, and I say "That's beautiful" just like the last 300 people you showed it to, I don't want anyone complaining, "But the whole reason I showed that to you is to find out whether rationalists had anything to say!"
It's a warning against making your identity big.
Let's take your example'
..."oh, well, it's projection of 3d on 2d and it follows such math" or "one of the main reasons why brain thinks something is beautiful is symmetry" Though true, these seem like kinda dumb things to say about a painting? "Look at this picture!" "Ah yes, pictures, projections of 3D space onto a 2D plane" misses 99% of the point. Note that these are more useful if you are trying to create a painting, or analyzing the technical details of the painting (e.g. "wow what good linear perspectiv
At the Singularity Summit yesterday, several speakers alleged that we should "reach out" to artists and poets to encourage their participation in the Singularity dialogue. So at the end of one such session, a woman went up to the audience microphone and said:
"I am an artist. I want to participate. What should I do?"
And there was a brief, frozen silence.
I wanted to leap up and say:
And if she'd asked me afterward, my real answer would have been:
But I didn't say any of this, of course. It would have been indecorous.
And while we're on the subject, I would feel rather patronized - like a dog commanded to perform a trick - if someone presented me with a painting and said, "Say something mathematical!"