Why Not You And I?

The sun and the moon are different! We all know the reason why. They're as different as night and day, yet they choose to share the sky. The plants and the animals are different! It's the way the world was planned. Yet, despite their apparent differences, they choose to share the land. The creatures in the ocean are different! As different as they can be. But that doesn't seem to bother them as they choose to share the sea. Which makes me wonder... If the creatures can share the ocean... if the sun and moon can share the sky... if the plants and animals can share the land... What is stopping...you and I?