Edited by Patsy Wang-Iverson
The shape of this action model can be changed from "Arrow" to "Heart" by squashing. Last year, my good friend Jim Weir taught me a model he learned at the 2015 OrigamiUSA Convention: a modular action model called Squishy Parallelepipeds created by Tom Hull .
The cool geometric transformation was so intriguing, it inspired me to develop a single piece version.
Click on picture for diagrams.