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The first preoccupation of organic chemists was to develop their ability to reproduce the organization of atoms in natural products. This incursion in nature's laboratory gave rise to numerous techniques to transform matter but led to the discovery of her subtle way of produucing substances with chirality and the preference of one enantiomer over the other in the living matter gave a lesson in perfection. The development of asymmetric synthesis gave the opportunity to elaborate methods, reagents, and reactions in order to prepare enantiomerically pure compounds. But this jorney is far from being over, and there is a lot of surprises left. No chemist would have thought that an enantiomerically impure chiral auxiliary or ligand could give a stereoselection higher than its own and even equivalent to the pure one.