still, energy and mass don't really exist, they are only products of human imagination
"giving an airy nothing a local habitation and a name" - temporarily
imagination itself is the underlying basis here
we imagined the world to be flat and feared Columbus would fall off the end, our imagination was faulty. Now the world is round and we float in space-time-mass-energy
but again, our imagination is faulty
but imagination is still the "only" true underlying reality, have a look at imagination itself
we now need "imaginative" words like
"strangeness" and such to describe our new world view of atomic science.
Maybe this is a hint ..... of where we are really going.
..............just having fun