These are example Xcode projects that are to help demonstrate how autolayout works in iOS 6. Each project allows you to adjust settings and see how they affect the layout.
See the accompanying blog posts
Helps you learn how the various alignment settings in constraintsWithVisualFormat:options:metrics:views affect the way the layout engine handles display. It also allows you see how these options do not affect the superview, and that you need more than the example constraints to be un-ambiguous.