On the 21-st of October after 19 days of travellimg I got this amazing cover, devoted to the birth bicentenary of Louis Braille (1809-1852), the inventor of a system that combines embossed dots and which is applied to reading, writing, calculation and music for the blind.
Some words about the stamps on cover which are 2 from 4 in complete set:
On the block, produced in cooperation with the Portuguese Association for the Blind and Partially Sighted (Associação de Cegos e Amblíopes de Portugal – ACAPO), all the information appears repeated in Braille characters and on the limited space of the stamp, the word Braille can also be read in both types of characters. The remaining stamps of this issue are dedicated to each of the five senses, allowing for experiencing real physical interaction: the touch feels the embossed ink coming out of the tube; the smell receives the aroma of the cup of coffee; the sight detects holographic images on the spectacle lenses that change according to the position of the stamp; the taste identifies the flavour of vanilla on the glue of the stamp that shows an ice-cream; the ear is sensitive to the noise made by the file when you rub its rough surface.
And there was a souvenir sheet inside (see upper) devoted to 200th anniversary of the birthday of Louis Braille. I've already got one stamp with him and hope to get more since this topic seems to be very important, because this man made life of blind people better.
Thank you very much, Luis!