<pre>
> qplot(cut, clarity, data = diamonds, geom = "blank", group = 1) + 
+     geom_path()
<a href='web/graphics/ee1eee2a6c423738622ccc44b7558dbb.pdf'><img src='web/graphics/ee1eee2a6c423738622ccc44b7558dbb.png' /></a>

> qplot(cut, clarity, data = diamonds, geom = "blank", group = 1) + 
+     geom_path(position = "jitter")
<a href='web/graphics/99b0c5415d8ff8c8560d0214e5f67cc0.pdf'><img src='web/graphics/99b0c5415d8ff8c8560d0214e5f67cc0.png' /></a>

> qplot(cut, clarity, data = diamonds, geom = "tile", stat = "sum")
<a href='web/graphics/66fd73983d2213dce0d5099f3618330c.pdf'><img src='web/graphics/66fd73983d2213dce0d5099f3618330c.png' /></a>

</pre>
