Skyboxes are what surround the sandtray in the environment, i.e. the sky. They can be changed by the user to reflect and modify the mood of their sandtray design.
They can be changed by the user to reflect and modify the mood of their sandtray design. A user can add a light and airy mood by choosing an appropriate skybox. The user could also choose a dark and gloomy design.
Examples of skyboxes
The mystic forest example tray in the "Demos" slideshow demonstrates the effects that changing a skybox can have on a given sandtray design.
Several skyboxes are contained in the basic pack that comes with the environment. Additional skyboxes can be obtained by purchasing add on packs through in-app purchases.