So below is an animation of a quantum field's energy density fluctuating. Specifically, a gluon field. So the empty spots are not truly empty but where the field is at the lowest energy. I saw a video from veritasium stating that the quarks are likely to live on top of those lumps. Why? And another question is that what are those lumps? In QFT, high excitations of field energy results in particles. So are there gluon particles there? It seems not as the animation is about the gluon field in vacuum, not particles. And finally, if there are no gluon particles where those lumps are, then why would quarks want to be there?