] ▁ ▁and ▁[ 1 0 ]. ▁These ▁models ▁are ▁a ▁discrete ▁analog ▁of ▁Wiener ' s ▁medium ." ▁( The ▁models ▁in ▁their ▁cit ations ▁"[ 9 ]" ▁and ▁"[ 1 0 ]" ▁are ▁different ▁from ▁G H .) ▁ ▁Many ▁writers ▁have ▁called ▁the ▁We iner – R osen bl u eth ▁model ▁a ▁cell ular ▁automat on . ▁The ▁earliest ▁paper ▁found ▁by ▁Google ▁Sch olar ▁with ▁this ▁design ation ▁clearly ▁stated ▁is . ▁However , ▁as ▁mentioned ▁above , ▁the ▁continu ity ▁of ▁the ▁Wiener - R osen bl u eth ▁medium ▁has ▁not ▁so ▁far ▁allowed ▁as ▁precise ▁a ▁theorem ▁about ▁pers istence ▁of ▁patterns ▁as ▁the ▁one ▁for ▁G H ▁which ▁is ▁described ▁below . ▁On ▁the ▁other ▁hand , ▁several ▁the or ems ▁are ▁stated ▁in ▁ ▁which ▁are ▁similar ▁to ▁those ▁proved ▁in , ▁though ▁the ▁proofs ▁given ▁for ▁the ▁the or ems ▁in ▁ ▁are ▁less ▁clear ▁than ▁those ▁in ▁ ▁because ▁of ▁the ▁n atures ▁of ▁the ▁respective ▁models . ▁ ▁See ▁also ▁ ▁for ▁an ▁often ▁c ited ▁computer ▁study ▁based ▁on ▁a ▁model ▁which ▁is ▁similar ▁to ▁that ▁of ▁Wiener ▁and ▁Rosen bl u eth . ▁ ▁Gener ating ▁a ▁spir al ▁One ▁interesting ▁behavior ▁is ▁seen , ▁for ▁a ▁four ▁cell ▁neighborhood ▁and ▁a ▁square ▁grid , ▁when ▁the ▁initial ▁condition ▁consists ▁of ▁a ▁half ▁line ▁of ▁excited ▁cells ▁( 1 ' s ) ▁going ▁off ▁to ▁infinity ▁and ▁below ▁this ▁half ▁line ▁a ▁half ▁line ▁of ▁ref ract ory