Originally Posted by: jimmynitcherAnd if you say the same answer applies, then I'm really confused because I can't see how the relativity you speak of can produce a different shape, as there would be no point in having the shapes in the first place.

Check your email. :)

In general the answer is that it is possible to play the same note in more than one place on the guitar.

So it's not a matter of "relativity". The notes are what they are. It is simply that you can get different shapes depending upon the multiple possible locations of the notes.

See this:
http://www.guitartricks.com/tutorial.php?input=419