To view this video please enable JavaScript, and consider upgrading to a web browser that supports HTML5 video Movie S3. An animation illustrating the choice of the flap angle for a quad strip in Fig. 3C in the main text. An additive algorithm for origami design Levi H. Dudte, Gary P. T. Choi, and L. Mahadevan PNAS. 2021. 118:None-None DOI: 10.1073/pnas.2019241118 Download Original Video Browse All Videos »