Encwadini kaFrank Herbert ethi Dune, kungani isinongo sibalulekile?
Context:Izibungu zesihlabathi ziyizidalwa ezinkulu ezifana nezimpethu ezihlala endaweni eyihlane i-Arrakis. Izimpethu zezibungu zesihlabathi zikhiqiza umuthi obizwa ngokuthi i-melange (owaziwa ngokuthi "isinongo"), okuyinto ebaluleke kakhulu futhi eyigugu kunazo zonke endaweni yonke ngoba yenza ukuba kube nokwenzeka ukuhamba phakathi kwezinkanyezi ngokuphepha nangokunembile. Imithombo ye - melange itholakala olwandle lwesihlabathi sase - Arrakis, lapho izibungu zesihlabathi zihlala khona futhi zizingele khona, futhi ukuvuna izinongo esihlabathini kuwumsebenzi oyingozi ngoba izibungu zesihlabathi zinobutha futhi zifuna indawo yazo. Izimoto eziqoqayo kumelwe zihanjiswe ngendiza zingene futhi ziphume olwandle lwesihlabathi ukuze kugwenywe ukuhlaselwa izibungu zesihlabathi. Impi yokulwela ukukhiqizwa nokunikezwa kwe-melange iyisihloko esiyinhloko se-Dune saga.
Lezi zinongo ziyigugu ngoba ziyindlala futhi zibalulekile ekuhambeni phakathi kwezinkanyezi. Le nongo iyindlala ngoba itholakala kuphela kuyiplanethi i-Arrakis, futhi ukuyikhipha kunzima ngenxa yokuba khona kwezixuku.