The most fundamental entity in nature is the pointlike particle. All microscopic phenomena known today are explained by interactions among several kinds of particles. When the interactions are weak it is possible to make quantitative predictions by direct methods, but when they are strong it is necessary to revert to lattice models that can be simulated on the computer. Recently a way was discovered to incorporate chirality, a fundamental property of particles, into lattice models. This development extended vastly the reach of lattice models and may even expose the mechanism by which chirality is realized in nature.