I was reminded to pay more attention to this recently. I was walking through a neighborhood and a young lady came out the front door of her house, looked up, and gasped in wonder. She saw I'd noticed her reaction, smiled, and explained, "the sky is so beautiful".
And indeed it was, it was sunset, and the clouds over the row of brownstones were a spectacular pink hue. I probably wouldn't have registered it if she hadn't shared her moment with me.