Considering one vertical column of swirls to be the strip pattern it would seem that the motif is the combination of two swirls where one swirl is the vertical reflection of the other. Since there is not vertical reflection symmetry, but there is glide reflection symmetry and no horizontal reflection lines, the crystallographic characterization of this object is p1a1. -Ryan F.
http://math125fall2014.blogspot.com/2014/09/strip-pattern_57.html This is Ava's strip pattern
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