Love is the universe flowing through itself.
When you open your heart and love, this is the universe flowing through you. This is the shape of the universe. And when you open your heart, this is like creating that hole in the center of the torus or doughnut, which allows the universe to flow through you. So love is the universe appreciating itself, or, you could say, one specific aspect of the universal oneness appreciating another specific aspect of the universal oneness. Unconditional Love is granting validity for everything and all beings to exist - just as they are.