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The study of acoustics, as well as a great mental exercise, helps us in comprehending the causality connection between a number of external circumstances and their effect on our hearing.
If such a study is normally really important for all students, it is even more for blind ones, which must rely on hearing more than other people.

Based on this principle, it was created a short handbook that will help blind students to discover the music "alphabet " and to reveal some important similarities between visual phenomena and the corresponding acoustic manifestations.
It is through the study of acoustics that blind people, even blind from birth, may give a new meaning to terms such as " colour", " chromatic contrast ", "shade “, and so on, or to some typically visual phenomena as the perspective effect.
Not a cryptic text anyway, but something that can offer the possibility to become aware of the important correlations between the two main distance senses, sight and hearing, as well as discovering related points of contact and differences.

As example, talking about common points, we could quote the ability of the two senses of giving space and time directions (distance, source, extent, sequence and simultaneity, order and proportions), while as for the differences, it is to mention the ability to hear sounds and noises from all directions, unlike view, whose perceptual field just extends for about 180 °.

Finally, if one takes into account that, thanks to acoustic sensations in combination with tactile and anemestesic ones (the perception of the wind), blind people can detect many types of obstacles (although not all), the study of acoustics becomes even more important not only for the scientific point of view, but also for the achievement of a greater degree of autonomy, fundamental assumption for a psychological individuality.

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