It is the reciprocation between the self and the unself. The self is the individual sense of being a complete individual even in the absence of everything else perceived. The unself is the reservoir of beingness from which the self origionates- it is like the sunlight from which plants grow- yet the two are just two aspects of the same. The relationship between them is always love, it cannot be anything else. The self, who cannot exist without the unself, contains unself as a glass holds water, has as a property of its unique form the ability to "love" according to its uniqueness. You do not love, you are love's insturment. Love is unself (beauty) perceived and Beauty is that love embodied within all form. The reason why we do not love everything is because our unique self acts as a filter. It blocks some of the unself radience. metaphysically, although we contain unself, as the glass contains water, we are not transparet against all of it. Thus, we radiate a portion of unself according to who we are and we also perceive it radiating from others accoring to who we are. Plato theorized that we perceive beautry that reminds us of, or resembles "pure form." And he theorized that the place from where our knowledge of pure form comes from is from before our birth. And to believe any of this you must believe that existence transcends birth and death. Plato was right. Love is beauty perceived and beauty is love that is our existence.