sa ▁would ▁have ▁perfect ed ▁a ▁per ma f rost ▁co ating ▁for ▁O la f ▁by ▁the ▁second ▁movie . ▁ ▁According ▁to ▁S me ed , ▁the ▁Earth ▁Gi ants ▁" had ▁a ▁long ▁rig ging ▁process " ▁in ▁order ▁for ▁the ▁characters ▁to ▁move ▁without ▁"[ see ing ] ▁solid ▁rock ▁pen etr ating ▁solid ▁rock ", ▁while ▁Mar lon ▁West , ▁the ▁film ' s ▁head ▁of ▁effects ▁animation , ▁said ▁that ▁the ▁film ' s ▁effects ▁team ▁had ▁the ▁objective ▁of ▁generating ▁" ro cks ▁that ▁would ▁fall ▁out ▁of ▁the ▁joint s ▁as ▁they ▁moved ", ▁though ▁they ▁had ▁to ▁be ▁careful ▁to ▁avoid ▁making ▁the ▁rocks ▁dist ract ing ▁to ▁the ▁audience . ▁ ▁Upon ▁the ▁reve al ▁of ▁the ▁te aser ▁poster , ▁G ad ▁announced ▁that ▁the ▁snow f la ke ▁on ▁it ▁has ▁" qu ite ▁a ▁few ▁surpr ises ". ▁In ▁July ▁ 2 0 1 9 , ▁American ▁ast ro phys ic ist ▁Neil ▁de Gr asse ▁T ys on ▁raised ▁an ▁issue ▁that ▁" W ater ▁cry st als ▁have ▁hex ag onal ▁“ six - fold ” ▁symmetry " ▁shown ▁correctly ▁in ▁previous ▁film , ▁but ▁this ▁poster ▁shows ▁four ▁instead . ▁Director ▁Lee , ▁in ▁a ▁reply , ▁said ▁that ▁it ▁is ▁not ▁really ▁a ▁snow f la ke . ▁Later , ▁it ▁was ▁revealed ▁in ▁film ▁that ▁these ▁four ▁edges ▁represent ▁the ▁four ▁element al ▁spirits , ▁while ▁its ▁center ▁represents ▁the ▁fifth ▁spirit ; ▁El sa