2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/201346I start with an elementary observation about the pressure in the deconfined phase of a SU(3) gauge theory without quarks. This suggests a ``fuzzy'' bag model for the analogous pressure in QCD, with dynamical quarks. I then sketch how the deconfined phase might be described using an effective theory of Wilson lines. To leading order in weak coupling, the effective electric field appears in a form familiar from the lattice theory of Banks and Ukawa.9 pages, 2 figures, PTPTeX. Based upon a talk given at Yukawa International Seminar (YKIS) 2006, ``New Frontiers in QCD -- Exotic Hadrons and Hadronic Matter''High Energy Physics - Phenomenologytext