Here is the difference between good design and poor design from the visual standpoint.

Stanford gives the information like this:

http://www.stanford.edu/group/scspi/cgi-bin/facts.php

A designer designed them like this:

http://www.fastcodesign.com/1663552/infographic-of-the-day-the-inequality-of-america?partner=homepage_newsletter

See attached for big version.