Download the vector graphics program Inkscape at: http://inkscape.org
It's a guide on how to draw the crease patterns for whirlpool spirals (and coil folds) with the method introduced in the book. While the book explains the construction and gives angles etc., I figured not everyone would know good ways of simplifying the actual drawing process. Hence this video.
So yes, it's probably a video that only makes sense if you have the book, but hopefully it will be a very helpful video for all those that do have or get it.
And to those that don't have the book: You can download the example crease pattern I drew in the video. So you'll be able to fold at least one whirlpool spiral to get a taste of what they're like. :)
P.S. It was easier to record this video than to make an instructional video for the navel shell, as it was only 15 minutes of recording. I also recorded it before the voting (on which model I'd do an instructional video for) concluded. Hence this crease pattern drawing guide is available first. The navel shell video will be the next one I work on, I just need to find some time where Felix sleeps for an extended period - probably somewhere in the middle of the night. Ah, sleep deprivation, how I love you!