• An outside reverse fold consists of two radial valley folds extending from a single point on a central fold and a reversal of the centerfold on the affected end, all done simultaneously.
• An inside reverse fold consists of two radial mountain folds extending from a single point on a central fold, and a reversal of the central fold on the affected end, all done simultaneously.
Resources:
WWW.DEV.ORIGAMI.COM
WWW.SANGER.AC.UK
WWW.MONKEY.ORG
WWW.HAPPYMAGPIE.COM
WWW.SARAHSORIGAMI.COM