Hoogezand, The Netherlands. In living organisms, we sometimes see spots and stripes as regular, orderly features, but more often they are varied and somewhat irregular, like the spots on a leopard or the stripes on a zebra. Services. Sand blows over the upwind face, which stands at about 15 degrees from the horizontal, and falls onto the slip face, where it accumulates up to the angle of repose of the sand, which is about 35 degrees. Discover the magic of the internet at Imgur, a community powered entertainment destination. [3] Centuries later, Leonardo da Vinci (1452–1519) noted the spiral arrangement of leaf patterns, that tree trunks gain successive rings as they age, and proposed a rule purportedly satisfied by the cross-sectional areas of tree-branches. Tilings: tessellated flower of snake's head fritillary, Fritillaria meleagris, Tilings: overlapping scales of common roach, Rutilus rutilus, Tilings: overlapping scales of snakefruit or salak, Salacca zalacca, Tessellated pavement: a rare rock formation on the Tasman Peninsula, Cracks are linear openings that form in materials to relieve stress.

[90][91], Snapshot of simulation of Belousov–Zhabotinsky reaction, Helmeted guineafowl, Numida meleagris, feathers transition from barred to spotted, both in-feather and across the bird, Aerial view of a tiger bush plateau in Niger, Fir waves in White Mountains, New Hampshire, Patterned ground: a melting pingo with surrounding ice wedge polygons near Tuktoyaktuk, Canada, Fairy circles in the Marienflusstal area in Namibia, Human brain (superior view) exhibiting patterns of gyri and sulci, Visible regularity of form found in the natural world, Aristotle reports Empedocles arguing that, "[w]herever, then, everything turned out as it would have if it were happening for a purpose, there the creatures survived, being accidentally compounded in a suitable way; but where this did not happen, the creatures perished. Already registered? [75] While common in art and design, exactly repeating tilings are less easy to find in living things. All seeds are collected from our plants.

[29] Plants often have radial or rotational symmetry, as do many flowers and some groups of animals such as sea anemones.

Thermal contraction causes shrinkage cracks to form; in a thaw, water fills the cracks, expanding to form ice when next frozen, and widening the cracks into wedges. A result of this formula is that any closed polyhedron of hexagons has to include exactly 12 pentagons, like a soccer ball, Buckminster Fuller geodesic dome, or fullerene molecule. [62] Smooth (laminar) flow starts to break up when the size of the obstruction or the velocity of the flow become large enough compared to the viscosity of the fluid. [71], At the scale of living cells, foam patterns are common; radiolarians, sponge spicules, silicoflagellate exoskeletons and the calcite skeleton of a sea urchin, Cidaris rugosa, all resemble mineral casts of Plateau foam boundaries. Leaf of cow parsley, Anthriscus sylvestris, is 2- or 3-pinnate, not infinite, Fractal spirals: Romanesco broccoli showing self-similar form, Angelica flowerhead, a sphere made of spheres (self-similar), Trees: Lichtenberg figure: high voltage dielectric breakdown in an acrylic polymer block, Trees: dendritic copper crystals (in microscope), Spirals are common in plants and in some animals, notably molluscs.



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