The each species of skywhale carries a different biome on their back. For a planet to exist with variable geography, individuals of the various species must band together and fit the environments they carry together.
These sculptures are the work of Ruilin Wang in his DREAMS-ark series. There are tree-covered cliffs on the humpback whale above, an arctic seascape on the sperm whale below, and icy mountain ranges on the blue whale below. See more images, and other works, at Wang's Behance page.
[via My Modern Met]