Roassal tutorial: a visualization engine largely used within the Pharo community

Wow. Looking at http://agilevisualization.com/AgileVisualization/QuickStart/... and http://agilevisualization.com/AgileVisualization/Roassal/010..., this tutorial looks infinitely more useful than the original post.

Partly because it actually shows pictures of the visualizations you get for a given piece of code.