Portia: (haven't figured out the quote thing):
"When the sun is shining and the birds are singing....seems pointless."
I don't think it's depression or sadness but as you said...the way things are. You aren't saying it's awful. You aren't saying it feels bad. You are just wondering about the point of it all, right?
What you said made me think of things my favorite teacher, Pema Chodron has to say. It's about "groundlessness", and when I read it, I was reminded of days as a child contemplating the universe, people, nature, time (boy, I did that a lot), this state of "being" and sometimes (not depressingly, mind you) coming to the conclusion that it could very well be pointless, but it's ok even if it is.
"Impermanence becomes vivid in the present moment; so do compassion and wonder and courage. And so does fear. In fact, anyone who stands on the edge of the unknown, fully in the present without reference point, experiences groundlessness. That's when our understanding goes deeper, when we find that the present moment is a pretty vulnerable place and that this can be completely unnerving and completely tender at the same time." (from the book "When Things Fall Apart")