Agar

An agar is any pattern covering the whole plane that is periodic in both space and time. In other words, they are the shift periodic configurations contemplated in symbolic dyamical systems theory, although this characterization is not always followed rigorously. Low entropy and a semblance of order is the real criterion; for instance the chicken wire pattern follows strict transversal periodicity 2, but almost any longitudinal mesh length is acceptable. For some examples see

• chicken wire, which is a static agar with the characteristic mentioned.
• houndstooth agar, occupying 4x4 blocks in a square lattice oscillating with period 2,
• onion rings, static on a color lattice (complementary sublattices alternate checkerboardwise),
• squaredance, a phoenix of period 2 which is shift periodic,
• Venetian blinds, period 2 varying only longitudinally, and
• Zebra stripes which is static; both of these have cross sections following Wolfram's Rule 22.

See also

• List of agars

External links

• Agar at the Life Lexicon