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The two structures at the left have been built-up according to the Stack-and-Drag model, from the bottom, thus below the visible structure. This is in line with the actual embryonal development of a sunflower head (~1mm, photo by Pieters). The structures at the right side are center-outward stackings (using the Dislodgement model). Center: a virtual shrinking pattern. In the figure bottom right, published in Mathematical Biosciences, you recognize the nearly centric character of vegetative pattern formation in the left cross section.