Philosophical astonishment - describe your feeling of it.
I experience it as a time-numbing pleasure in which my need for definitive answers somehow coexists with my desire to remain mystified.
> Oh yes, indeed, Socrates, I often wonder like mad what these things can mean; sometimes when I'm looking at them I begin to feel quite giddy.
> I dare say you do, my dear boy... For this is an experience which is characteristic of a philosopher, this wondering: this is where philosophy begins and nowhere else. And the man who made Iris [the rainbow, messenger between earth and heaven] the child of Thaumas [which means "wonder"] was perhaps no bad genealogist.