It's no secret that transformation is at the heart of this myth. First, Zeus transforms into Artemis to seduce the nymph. Then, he transforms Callisto from a not-pregnant nymph into a pregnant one (using the traditional process). As a punishment, Artemis transforms her loyal follower into a she-bear. And to top it all off, Zeus then transforms Callisto and their son, Arcas, into the constellations Ursa Major and Minor. Dude, how many transformations can one myth take?