I think he means the background?
That wouldn't work because in Space Engine, there IS no background layer (unless you count the blackness of space), just points of light of varying distance, which is why you can click on those distant stars which might appear to be in the background. In Ubox, the background is exactly that, a background which cannot be interacted with, if it wasn't there, you would see, well, you wouldn't see anything because the background would be black (or maybe white) because it's not displaying anything.