[adrian_b]

I have referred to "beautiful" only with its strict concrete meaning, as applicable to the sensation caused by something you are looking at, like a beautiful flower, a beautiful waterfall or a beautiful human.

You have also used "beautiful" in its generalized abstract sense, when it becomes applicable to things like a beautiful mathematical theorem or a beautiful computer algorithm.

In the second sense of the word, there is no relationship with the attractiveness of a human. In the first sense of the word, I recognize anything beautiful when I see it, without thinking about a reason. In the second sense, I realize that something is beautiful only after an intellectual analysis of it.

Also in the first sense, the word "beautiful" is frequently reused for other sensations than vision, e.g. for a beautiful song or a beautiful fragrance, though it would have been better to have distinct words for these cases.