Great Wall

Yesterday I happened to come across the term "The Great Firewall".. It just occurred to me that in different era different type of wall was build but originate from the same country and perform a some how near similar function of block/fence off.

First we have the "The Great Wall".. and now we have "The Great Firewall". One as physical wall in battle another as virtual wall in cyberspace. This just tell us how much the world have change with technology..