One of Tufte's many contributions is the concept of "data-ink ratio": how much of the ink used to print a chart is used to show the data as opposed to, say, decoration?
This example, showing the quintile ranking of utility funds, has a very low data-ink ratio. The dots serve only one purpose, to make the reader dizzy. The data stands out once the dots are banished, as shown below.
Reference: "Lipper Leaders", Wall Street Journal (free this week), Nov 7 2005.