For me it's obvious why the heart is depicted as the center for love. It's here, in the chest where I feel a great wave, a rush of feeling when a moment pulls the curtains away and shows me the love I feel for someone/thing. It's as if my torso decided to remind me that it is still there and serves a function beyond physiology. I swell up and get filled with wonder, awe, amazement, happiness and sadness all at once. The sadness comes at the end when I realize that this is a moment and that I will soon forget to be in it and will likely revert back to the way I was before, in love but with the curtains drawn.