2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/39117Perfect lattice actions are exiting with several respects: they provide new insight into conceptual questions of the lattice regularization, and quasi-perfect actions could enable a great leap forward in the non-perturbative solution of QCD. We try to transmit a flavor of them, also beyond the lattice community.Talk given at the 31st International Ahrenshoop Symposium on the Theory of Elementary Particles, Buckow, 2-6 Sep 1997. 17 pages, 13 figuresHigh Energy Physics - LatticeHigh Energy Physics - PhenomenologyHigh Energy Physics - Theorytext