I think it's safe to say that it only has a marginal functional advantage; it merely gives you slightly more information about what is going on in the backgroun

I think it's safe to say that it only has a marginal functional advantage; it merely gives you slightly more information about what is going on in the background. It's pleasing to look at because our eyes are used to all kinds of light interactions between objects. Its main purpose however is probably to communicate technological advancement in order to increase interest in their product.