A Code and Theory project / http://www.codeandtheory.com
maintained by Joshua Davis and James Cruz, is a collection of classes that performs heavy lifting tasks while using a minimal amount of code writing.
Simply add a copy of HYPE.pde to your sketch folder. That file contains the all the classes found in the pde/ folder. This means you don't have to mess up your own sketch folder by copying 4 or so dozen files into it.
Since the addition of ProcessingJS into Processing 2.0 Beta, and the ability to publish to HTML using canvas... but the IN-ability to use external .jar libraries, HYPE was initially created using the .PDE format so that publishing to JavaScript was still a posibility.
If so, then it means that we updated our code but we haven't generated a new HYPE.pde yet. If you want to still test the code, you can still do it by copying the files in the pde/ directory into your sketch folder.