Adelbert von Chamisso

This man, although he appeared so humble and embarrassed in his air and manners, and passed so unheeded, had inspired me with such a feeling of horror by the unearthly paleness of his countenance, from which I could not avert my eyes, that I was unable longer to endure it.

What I look for when I see a piece of art for the first time is some kind of emotional, intellectual experience, that's a combination of both of those things and is informed by my knowledge and something new that I see the artist doing.