Black Skybox

Of course, the object can be edited to change the color. So if you need a white sky, or blue, or pink or whatever, is possible. It will always be a flat color.

One problem of this idea is the engine occlusion may make one of the walls invisible in certain positions of the camera. The occlusion has no idea of the textbox size. Maybe put more than one rotated, so they cover each other blind angles.

This was based on the excellent dream "Hello World" from BukkoroChan. Mad respect for his work!.