Forget-me-nots form a sky-blue cloud floating on several of my flower beds. The dashes of color--purple money plant, the white bells of leucojum--poke out above the ground-hugging blue cloud. Naturally enough, our attention focuses on the taller red tulip or yellow daffodil or purple money plant. This is a gardener's definition of attention.
That blue haze at the base of the garden represents our peripheral awareness. While we focus on the beautiful, the different, the unique, we are also aware of bird song, cool breeze, and that blue haze of forget-me-nots.
Try this in your meditation. Spend one period of meditation simply noticing how the mind works. Hearing, seeing, feeling are all happening in the background, then the mind is drawn to something or other (probably a thought) and focuses on that.
Smile. You've just succeeded at noticing the difference between attention and awareness.