It is easy to observe that most of the acts performed each day are of the same or a very close nature, while other acts would be performed less frequently. Hence the idea that rare acts, like rare objects and rare metals and gases, exist which are distinct and have particular psychological, cognitive, emotional, and social psychological effects. Human activities in general are not satisfied with the banality induced by repetition and the perfect knowledge that frequent acts bring, but they are guided more by a desire for innovation or progress, in other words, by a more or less chaotic tendency toward types of rare actions at a given moment. In many cases, the rare act can be considered as the goal of frequent acts, as something that gives them meaning and which, by transcending each of them, proves to be invaluable in moments of doubt, fatigue, and despondency.