Last week in the real world someone asked me to explain it all to them and I think I just about managed but since then I've come across this which is the simplest explanation of it all I've seen.
<object width="400" height="225"><param name="allowfullscreen" value="true" /><param name="allowscriptaccess" value="always" /><param name="movie" value="http://vimeo.com/moogaloop.swf?clip_id=3261363&server=vimeo.com &show_title=1&show_byline=1&show_portr ait=0&color=&fullscreen=1" /><embed src="http://vimeo.com/moogaloop.swf?clip_id=3261363&server=vimeo.com &show_title=1&show_byline=1&show_portr ait=0&color=&fullscreen=1" type="application/x-shockwave-flash" allowfullscreen="true" allowscriptaccess="always" width="400" height="225"></embed></object><br /><a href="http://vimeo.com/3261363">The Crisis of Credit Visualized</a> from <a href="http://vimeo.com/jonathanjarvis">Jonathan Jarvis</a> on <a href="http://vimeo.com">Vimeo</a>.