The drawing above is belong to greatest architecture of Türkiye, Mimar Sinan. He wrote a letter and this drawing four hundred years ago. It is found in the brick walls of Süleymaniye Mosque during the restoration of the gates which are began decaying. Sinan calculated the deadline of the stones of the gates. Since he knew the tecniques will chance in time,he left a letter to help the architects who will try to resrorate it for helping them. He is incredibly talented and far-sighted architect.


The picture is taken from facebook.