The difference between features & projects is that projects are content that can not be viewed or experienced from your web browser.
The subsections of the projects section will help illustrate this.
Before going to the various project subsections, it is very important to note that some of the downloadable content will need external programs in order for you to utilize said content. Those programs would be...
On this webpage is the tangram program that you need in order to utilize my "pieces pack #1" expansion pack. There are also other independently-made expansion packs on that webpage as well. Windows only program.
This is an open source office productivity program that supports the .SXW file format. It is free & has been ported to just about every major operating system platform.