Sure there is "absolute space". The problem is, how do you perceive it? You can't, you have to form some sort of reference, which leads to relative. Absolute space would be no different. If we had a way to identify and reference it, then we could perform calculations relative to it. Imagine a blank painting canvas, the canvas is "absolute space". Until you paint an object onto it, you just have the canvas. The difference is, you can reference the canvas, you can paint in the top left corner. Once you paint an object, you begin, usually, painting the rest in reference to the object, forgetting the canvas in general, except for minding you're constraints. Space has no constraints. Or does it? The point Im trying to make is, even though we are moving on the earth, through the solar system, in our galaxy, expanding out through the universe, each motion causes us to move in the mother grid of space, passing through finite points along the way. We simply have no way to reference that space, to know our motion relative to that space, or to know that if we were to stop, whether we are moving still relative to that space.