Sky
Sky is not creatable, there's only one instance of it. It can only be accessed through its globally exposed variable.
Sky defines properties of the scene global lighting and colouring.
Properties
Bottom color of the scene background gradient, default RGB (0, 93, 127).
Middle color of the scene background gradient, default RGB (153, 242, 255).
Global scene lighting color, default RGB (255, 255, 234).
If using a directional Light object in the scene, reducing [Sky.LightColor]'s overall brightness will help creating more contrast from the directional light.