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When our interlocutor begins to show signs of incomprehension about what we are trying to explain, there is a moment when we all we started making faces. Commonly, this type of signal corresponds to a type particular difficulty that concerns more the nature of what is intended to understand. In minority cases, they may still be signs of impatience given the scarce intellectual resources of the interlocutor, and, in even more minority, may be expressions of physiognomic pathologies with a spectrum of more or less diverse causes. The case that interests this work has less to do with grimaces themselves rather than the difficulties they raise and therefore excludes all those anomalous cases I just mentioned. My purpose too is not a portraitist, although, at certain moments, the present work may tend towards a certain descriptive detail that usually characterizes this representation mode. Difficulty in this work must be understood, succinctly, as an acid disturbance This class of difficulties must, therefore, be more or less associated the exercise of a practice that is unexpectedly surprised by its ineffectiveness the application of a certain norm or judgment. It should therefore be read that I'm talking about those types of difficulties that don't keep you up at night from that set of people who I would call, perhaps not really up to date, amateurs. Put For example, when an aspiring physicist tries to explain to another aspiring physicist what the «Principle of Relativity» or when an aspiring logician tries to explain it to another aspirant what is «Propositional Calculus» or when someone, aspiring to computer hardware engineer decides to upgrade the motherboard of the computer your own PC without drivers, without installation manual, without connection cables and unaware of whether the design of slots and sockets is compatible with the rest of the equipment. While not taking away the sleep of this group of people, it is, however, very disturbing. t