I suspect those lines are some sort of field effect for deflecting and attracting energy sources and whatever other objects their constructors have in mind.

Perhaps they are quantum fields for attaining warp effects, or, crossing dimensions.

The blue cross orbs look like the mechanisms for constructing and maintaining those fields.

Why else have these in space, if not for some specific purposes?

With all we DO NOT KNOW in our 'modern' science, we must look like we are at child's play to our peers throughout the multiverse.

All of it amazes me.