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Between t = 0 and t = 1 / 4, the volume and area difference are decreasing, leading the nearly oblate shape into a clearly stomatocyte configuration. For our purposes, we will not address the spontaneous symmetry breaking that is associated with crossing a transition line, but simply assume that once broken, the cycle will break the symmetry in the same way during each cycle. In the example shown, the stomatocyte inflates as it assumes a more oblate shape, expelling fluid from the cavity and producing vorticity along the lobes. As the vesicle continues to deflate from t = 1 / 4 to t = 1 / 2, the lobes sweep downwards, moving the stomatocyte upwards as it assumes a perfectly oblate shape. At t ≈ 0 . 42 the shape transitions into an oblate shape, precluding any net swimming by symmetry. The swimming velocity as a function of time is shown in Fig. 5b. As 

