<Li> <P> The Danish "Heart Book", a heart - shaped manuscript of love ballads from the 1550s . </P> </Li> <P> The Danish "Heart Book", a heart - shaped manuscript of love ballads from the 1550s . </P> <Li> <P> Augustine of Hippo holding a heart in his hand which is set alight by a ray emanating from divine Truth (Veritas), painting by Philippe de Champaigne, ca . 1650 . </P> </Li> <P> Augustine of Hippo holding a heart in his hand which is set alight by a ray emanating from divine Truth (Veritas), painting by Philippe de Champaigne, ca . 1650 . </P>

Why is a cartoon heart shaped like that