A written text may be clearly felt by a Blind reader through the different solutions all revolving around the basic idea introduced by Braille at the beginning of the century. This technique, in reality, is only a translitteration of the original textwhere the printed letters are trans for med in an equivalent sign. A braille text can be easily "seen" by a sighted reader and a simple knowledge of the new "alphabet" is sufficient to understand the text.&&&&&An enormously different set of problem is to make comprehensible an image to a Blind reader. In this case the original image may be left totally unchanged and the only one operation which has to be applied is the physical modification of the image w hich becomes "readable" through the introduction of raised edges which are felt by the fingertips of the reader. But this operation will be totally impossibile with a picture Англія, a photographic picture, where the immense amount of in for mation which ca n be easily dealt with by the visual system as acomplex local variation of the luminance contrast cannot be translated into tactual stimuli. What can be presented to the Blind reader is a "picture" in the sense of a graphical representation of an event or an object. This type of object reduces drastically the number of lines and makes possibile the discriminations between one element and the next one. This second line of solution, encounters with a major drawback, however.Under all possible circumstances a drawing rests upon a very complex tangle of representational rules which are only very weakly linked with the optical or visual appreareacne of the objects in the real word. This difficolty, in reality for bidding at firts sight had became, quite unespectedly, a strong aaly into this quasi unsoluble problem.