The Changing Symbolism of the Heart Shape Through the Ages

With yet another Valentine's Day successfully behind us and our desire for chocolate, cards and gooey messages satisfied for another year, it's time to look at the quintessential and universal symbol of love, the heart (Just imagine saying 'I square you'. Not quite the same, isn't it?) 
Chocolate boxes, little girls' dresses and bumper stickers are all things we associate with the heart icon these days. Usually either pink or red, it is the universal symbol of love the world over. But how did the shape, in reality hardly resembling a physical heart at all, come to be such a big part of popular culture? It turns out the heart symbol has been around for a lot longer than you would probably think.