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When our observations are all indirect (and yes, I mean *all* observations), I can't see how you can say that anything is absolute.
Let's start with gravity.
I will drop an anvil on your foot and you can confirm the fact that it exists.
it would appear that the kinetic energy transferred into my nervous system, that energy is in turn converted to electrical and chemical energy, which is interpreted by the brain as "pain".
Did I perceive gravity itself - or the biochemical manifestation of gravity?
Now, you're looking at my broken foot. Electromagnetic energy is converted to chemical energy which is interpreted by the brain through memory as a broken foot.
Did you perceive my broken foot - or the electromagnetic energy that represents my broken foot?
We live outside the universe. We always will.