Another 'visualization' tool 

 We've talked a lot on the blog about good ways of visualizing data.  For something a little lighter this Friday, here is one of the more unusual visualizations that I've come across: a time series of real housing prices represented as a roller coaster, which you can 'ride'.  It isn't perfect; they need a little ticker that shows you what year you are in, but it is a neat idea.  It would be fun to do something similar with presidential approval. 
  
        

 (hat tip:  Big Picture )