Hey guys, thanks for all the replies. Yes, kite diagrams are very useful in biology, for example, we're doing a study along a line transect on a rocky shore near the beach, and are taking 1sqm quadrat samples of organisms along that line, and comparing the organisms' population density, abundance, etc.
Anyway, this is what I have so far using an area chart:
http://img709.imageshack.us/img709/2252/screenshot20100304at724.png
As you can see, using positive and negative values works, except that "Barnacle A" and "Barnacle B" are both on the same Y-value, whereas they each need separate Y-value marks, as seen here:
http://www.heckgrammar.kirklees.sch.uk/webfiles/departments/biology/Image/Merlin/merlin_chart03kite.jpg
Is there an easy way to flip it so that those "Y-values" (the percentage cover, essentially) go on the x-axis, and the distance goes on the y-axis? Prob. easy, I know, but yeah..been a long night!