banksy.as appeared sometimes overnight in all kinds of public places in any number of cities around the world. it's a skill he honed while evading police a as a graffiti artist back in his early days. despite the fact a banksy can be worth many millions, his true identity remains a closely guarded secret, known only to a small number of friends and associates. with seth doane we look at the art and artistry of banksy. >> reporter: he sets his own rules in the art world. you have banksys around you here, but with no offense, isn't this operation exactly what he hates? >> oh, i have no doubt. >> reporter: the secretive british artist is giving us a glimpse into what makes him tick while still keeping most of us guessing. you have, obviously, you know who banksy is? >> i do know who banksy is, indeed. >> reporter: banksy coming up this sunday morning. >>> our david martin will be taking with oscar-winning actor morgan freeman who has gone behind the camera to tell the inspiring story of some lon

>> yeah, this is banksy.sy. >> reporter: his art is coveted but, of course, graffiti is not exactly legal. videos posted to his instagram reveal his guerrilla-style tactics to avoid detection. >> it was more about avoiding problems with the police. >> it was all about avoiding problems with the police and nothing to do with it being a promotional tour. quite quickly, it became the best promotional tour. >> reporter: steve laz reed he's was an early associate of banksy's in the working class town of bristol. >> what kind of guy is he? >> difficult. >> in what way? >> just in that way that sometimes people are ingenious what they're doing. there's no taking away from the fact that the guy's -- he's a legend. he was making images and messages that everyone could understand, and i think that's what was the game-changer. like somebody is making art that you didn't feel stupid looking at. >> he's sometimes criticized for that too, that it's too simplistic. >> yeah, buzz he's only criticized by -- and i'm going to s