Viral promotions for the much-anticipated "The Dark Knight" has sort of slowed down, but for anyone interested in the work that goes on behind the scenes on a production like this, check out this video on how the masks for the Joker's gang were created. 

Here, you can learn not only about how the different personalities were designed but also see, in time-lapse photography, how the individual masks were built, created, and painted. 

"The Dark Knight" hits theaters this July.