Hedgehog Star III (with proper color change)

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Since today is Polish Independence Day, I’m publishing a picture of my Hedgehog Star III folded in Polish national colors. This work uses a proper color change, i.e. each module is folded from a duo-color sheet and the final pattern of two colors is a result of elements of one side or the other being visible. In this arrangement, every other unit has its two sides reversed, resulting in a highly symmetric pattern. The back side looks the same except the colors are in negative: red is replaced by white and white by red compared to the front. I call such designs iso-area stars. Each unit is folded from an equilateral triangle.