4 11 TOROIDAL PHENOMENA lmplieu in our core model, and obvmus in Vlolent delonarions sueh as aromie explosions, pulis irorn diesel exliausl pipes. or deliberarely blawn as smoke rings, are lhe rolling doughnul-shapes a! TORI. A TORUS is a widespread nalural phenomenon The dosed rnodels irigure dual enelose sueh a ionis, end we ran imagine a slow-syrhng rorus or nulrienls surrounding ihe siern ol any Km as errmndrip names nuri-ienrs ro lhe ground, and lhe mis again rerurn lhem Via rhesremol IM oee, Phoiographir sulls ol alomie explosions may reveal yiolenily roiarrng lori around and rrowning ihe aseending eolunin or imuk: and deor . violenr up—draughu caused by loeal hear rreale surh rori in almospherie lherrnals, mueh appreeiaied by soaring birds and glider pilols, who ride rhe inner iaseendingl eurle oi lire doughnues oi hol air ihar ore generated, lor example,uvrr deseris on hoiahemoens A erunplex loroidal lorm is (he 'Robmson Com gmnte“ irigure um, porrraying lhe sparetime lnrm o: a mus—less parricle such as a pinion, represennng, in died, annidared ion DNA is also porrrayed as eneireling siren an imagrnary pluHonis in riguie m A Mooius sinp-a onesided rwisied loroid iolien porrrayed by MC Eiduex in hII dM—enables us io eross an edge wrlhour lining our penal Many hie iorrns produee rori leg some sea snail egg masses) We reiy on a iorus ol nipperl nllale our ryres and lo seal iamlar harrhes as O—rings A lorris is, in elieei, a speeial or lnineared ease or ihe cueroeeli .el iriguie ml, as . loerus is a lruneaied "iree‘. and (Zn or genera-ed by disrenlinuous or explosive llow, or pulses in llow A lonis is a dosed rhreedimensional yoriex One such elosed toroidal lorrn, as lound in bhck holes, is shown in figun on Here, aeereoon ol rriauer causes gaseous eyeerron ai the poles, as she earlh may have 'elezled‘ seas and eoniinenis al lhe magneiie poles, or gaihers in ihe violeni energy ol ionised parricles that harm lhe auroras, vislbk as polar ion in sarellne images, Even lhe long eurrains n1 lhe auroras seen rrarn ihe ground eonlarn yenieal spiral enluinnsll Reid pers Mum) 4.13 DIMENSIONS AND POTENTIALS; GENERATORS cur pmierned sysrems may exisr in lwo or more dimensions, We ran reasellare twa—dimemlnlufly lair need io enyisage rhiee dimeri * tor a me lorrn or glaeier Ihe "924mm: ol rivers llow down along S-shapud gradienlsr rlne generalor al' sueh a pauern is grayiry 51nd dunes iorin on near-liar plauorrns or rhe desen, and have wind as rheir generator, as do waves 88 on are sea Neilher gnwly nor wind may inneh aiieei rne ereeping iree paiierns ol mosses, dendriles in shales, or «he Inc-Illa iorrns ol rnyeorrhira in plan! eells h is here rhar weseeour nee lorrn asrhe besi way no grow or |0 galher nmnems in lhe dosenee oi yioleni lsinelic pm The genera-or here is hle or gaowlh irsell. When kinehe [om do nor aei snongly, as in nu dud essennally sheliered deserl environmenrs, lobulalion and lanieing sull oeeur as ireezeihaw or swell-shrink panerris, as they do in iee ilues on qulel ponds or in rhe hexagonal pauerns ol siones on rundra, The slow growlh ol crysiab inlo Mk eayihes or iee is snll relaied io our general model: rhe generaior pl pauem here being or ihe kvd oi moleeular iorees, as in many purely eherniorl proeesses, and ihelorrris generrled are iraelals hi hill eounrry, energies are usually a eonilainanon oi slream llow and grayily, On plains, ieepaeks or lial snowlields, u I! fluzrlluw or lhe swelling ol rlay in rain mat prodnees looularions or nerworks ol earih pallems lohulauon, rlie produriion oi sueh shspes as ' re n, diners in origin and mode ol explvswn lrorn rhe kineus-eneigy (flow) sysrerns we have been discussing lsornehrnes lhmir oi lhe lohrilaied hours as response oi name, or lile, lo s world lhsi lhreaiens * odifimnm“. ll lhe hills wear down, rhen lhe anrepenialhmaie suriaees will produre (he)! lareral, rwodirnensional lile pauerns, as does lhe lichen on a rock Kinerie erosron pm: are lheri exehanged lur physieal and ehermeal proeess ar the moleeular level, In“ even lhis malts a sullieieni dilierenre in media in. lire iorrns io expms themselves, and lor dillerenees ro arise in lhe pairerris ol surlates, 414 CLOSED (SPHERICAL) MODELS, ACCRETION AND EXPULSION Allhough trees (includlng rree roorsl may lpproach spherieal lorm, lhe hesl examples are lound in spherieal bodies in spare. “meridian lighi, dusi, and grs rowards hem, and may eapnue marshals, ln uyeir early lormalion, lhey lhenuelyes may have had dense eores rhal assembled rheir share ol galasrie normals, and around ehese cores a lorus pl mauer ol low or high-speed roialion ean lorrn. This is lhe model presenied lor mosi oodles (Nm 5(nmll, 4 Apn| ‘35, pp lzelol. A general model 7: green in Figure 4.11. As mnku xeeurnulares in rhis way, bodies ean respond py . Becoming more dense- iii a lirrui oneu g/rmJF . Swelling orexpanduig lprodueing shauer curds); and . gyeenng marenalai ine poles. or any eombinarion ol lhese depending on lhe sure