  The non-trivial ground-state vacuum fields of QCD form the foundation of
matter. Using modern visualisation techniques, this presentation examines the
microscopic structure of these fields. Of particular interest are the centre
vortices identified within the ground-state fields of lattice QCD. Our current
focus is on understanding the manner in which dynamical fermions in the QCD
vacuum alter the centre-vortex structure. The impact of dynamical fermions is
significant and provides new insights into the role of centre vortices in
underpinning both confinement and dynamical chiral symmetry breaking in QCD.
