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Plant with a succulent trunk with photosynthetic function and leaves transformed in thorns...
The problem of the wrapping of circumferences shown in a stack of wood.
A flower of Clematis sp..This photo puts in evidence a dihedral symmetry of type D4, so i...
Suggestions of radial symmetry in this sunflower. Helianthus annuus is an annual plant bel...
La geometria dei fasci di curve ("quasi" circolari) nella sezione di questo tronco.
A flower of Narcissus sp, an ornamental variety that belongs to the family of the Amarilli...
A domestic apple-tree (Malus communis), a plant used in cultivations. A photo taken from t...
