Each spring and fall, on the equinoxes, you can see Kukulkan descend El Castillo from the heavens. Here, you can see somewhat of an illustration of how this is created by the shadows of the platforms against the great staircase.
Kukulkan - (literally translated to "feathered serpent") - descending the restored sides of El Castillo at the Xichen Itza Ruins - Yucatan, Mexico
