An amazing article from Ed Yong describes a new mechanism for pattern formation:
Coloured Cells Chase Each Other To Make A Fish’s Stripes
Zebrafish patterns aren’t just controlled by a chemical reaction-diffusion mechanism — the pigment cells actually chase each other! The different color cells sort themselves into stripes, spots, or other patterns depending on their relative speeds.
Image 1: “Scanning electron microscope image of a bryozoan colony” (Source)
Image 2: “This skeleton of a living bryozoan, collected at Bahia de los Angeles, Baja California, clearly shows this typical colonial organiation.
Each individual, or zooid, is enclosed in a sheath of tissue, the zooecium, that in many species secretes a rigid skeleton of calcium carbonate. Each zooid in this electron micrograph is less than a millimeter long and has a single opening, the orifice. Through this opening, the lophophore, a ring of ciliated tentacles centered on the mouth, protrudes to capture small food particles. The lophophore can be retracted very rapidly by specialized retractor muscles, and the opening closed by a doorlike operculum, visible on some of the zooids in the picture at the left.”
Image 3: Membraniporella nitida (source) cc-by-nc-sa
More info: http://en.wikipedia.org/wiki/Bryozoa
Madreporites on sea stars
”The madreporite is a lightcolored calcerous opening used to filter water into the water vascular system of echinoderms. It acts like a pressure-equalizing valve. […] Close up, it is visibly structured, resembling a “madrepore” (stone coral, Scleractinia) colony.” — Wikipedia
Image 1: Madreporites, from Pierce and Maugel’s 1987 Illustrated Invertebrate Anatomy (via “How Starfish Move”)
Image 2: Madreporite of Henricia pumila:”The madreporite is creamy colored as in the type specimen. Notice the papulae extended among the pseudopaxillae.” (Source)
I don’t know what to call this pattern, but I like it!
Image 1: “The Maze” by Debralee Wiseberg (link and another gallery)… I think it’s corroded metal?
Image 2: 2,2-(Bipyridine)(Naphthalene)-fusion melt (25x)
Herb Comess. Honorable Mention, 1994 Nikon Small World Photomicrography Competition (link)
by Barbara Doser and Hofstetter Kurt, 2006
medien.KUNSTLABOR, Kunsthaus Graz
“A screening of ecstatic moments created with the Video Feedback technique at the event horizon of perceptible worlds of image and sound while generating a moving picture. Moments distilled from experimental videos and compiled into a new unit.
Video Feedback is mapping (imaging) any visual event (image) to itself through parallelism and circulation. A minimum change of its instrument positions (video camera | screen) generate a maximum of stimuli at the time-based event horizon of perception. A flood of rapidly changing abstract images on the move will be experienced as a world of spatial complexity and of dynamic states.”
Background info on optical feedback
More animations from this Wikimedia gallery of animations from Conway’s Game of Life!
Pulsar (period 3)
Another 3-period oscillator
This one’s also really cool, but it’s not uploading for some reason