If you went and saw the retro gaming-inspired flick Wreck-It Ralph at  the cinemas, youd have also seen the excellent short Paperman that  plays before it. Walt Disney Animation Studios recently uploaded  Paperman to YouTube, where its accrued six million views in three days.  Papermans unique, loveable style is thanks to new tech the studio has  developed that blends old with new. 
 The studio calls the technology Meander and as 
Paperman director John Kahrs explains,  the idea behind it was to bring across the expressiveness and  individuality imparted to characters by an artists hand and merge it  with the power and flexibility of computer generated imagery. 
 He also mentions Disneys legacy and talent with traditional 2D  animation; being able to leverage that history and make it relevant in  an age dominated by 3D was something he felt important. 
 How is this blending achieved exactly? An 
article on Entertainment Weekly provides more specifics:
First the characters and backgrounds were rendered  digitally, and then hand-drawn art was layered over those shapes, giving  the figures a kind of 3D quality unseen in old-school animation. What  youre seeing is a very stylised CG layer [underneath], but the feel of  the image is very flat and lives in between the two, Kahrs says.
 The Meander program, created by Disney software engineer Brian  Whited, allows the 2D hand-drawn artwork to stick to the dimensional  CG layer underneath. A cynic would say its high-tech rotoscoping,  Kahrs says, referring to an old animation technique of tracing over  live-action film stills. Really its more than that. Its meant to  celebrate the line, and bring it back up to the front of the image  again.
But you certainly dont need to know the details to enjoy Paperman.  Its easily the best six-and-a-half-minutes youll spend today.