My favorite line of the hymn is this one:
Gloom hid in gloom existed first – one sea, eluding view.
That One, a void in chaos wrapt, by inward fervour grew.
To me personally, I see something coming from nothing, and good coming from gloom. It is a beautiful idea that from chaos came beauty. It speaks to me because it is simple and beautiful too.
I agree with akannan about the level of 'negative capability' in the Song (or should we call it 'hymn' properly, the Rig Veda being a set of hymns chiefly?). As I see it, it is a 'creation myth' or story in a sense-- and I guess all, or most, world religions/belief systems, have a Creation Myth/Story to tell: their version of how things came into being.
Interestingly, the Rig Veda, the Bible (and earlier Hebraic texts/Genesis etc as part of it) and the Quran, all seem to agree that Creation was an 'out of nothing' act, or phenomenon or process! Quite a common belief, really.