Observe your city on a rainy day. It does not seem that we are in the 50s? Or less? It is not satisfactory to imagine that this object you open when it rains just like it was used by Cleopatra, by Cain, by Methuselah at D. Peter I, by Machiavelli, by Tiradentes, by Einstein? This equates to the rest of humanity. And in a million years, will be using the same umbrella?