To give you a comparison, a single, static, square of pixels 256 by 256 would take the same amount of space to describe, if you weren't terribly clever about it.
To get all of this video into that, you have to be terribly, _terribly_, clever about it.
Making of here: http://geidav.wordpress.com/2013/04/14/making-of-turtles-all-the-way-down/
Original post on Dreamwidth - there are