Originally Posted by Boris Losdindawoods
FWIW: that diagram confused the heck out of me the first time I saw it because it's "upside down" compared to the way the piece of fabric fits into the bridge. Yep, that's ridiculous, but that's the way my brain works (or doesn't). It might or might not be confusing to others.
ha! And I drew it that way because when I'm working with the piece to cut the dart it is most natural (to me any way) to have the piece in front of me with the orientation in the diagram. All the fine motor control stuff involved has to do with the ruler passing though the point of the edge dart only the long side.
I hope it will be clearer in the 3D movie version, coming soon (?) to a video channel near you!