▁he hl k appe ▁( mod . ▁Ger . ▁he hlen ▁" to ▁hide "). ▁ ▁Modern ▁adapt ations ▁In ▁the ▁original ▁ep ic ▁N ib el ungen lied , ▁the ▁hero ' s ▁clo ak ▁not ▁only ▁gr ants ▁him ▁in visibility , ▁but ▁also ▁increases ▁his ▁strength , ▁to ▁win ▁over ▁the ▁I cel and ic ▁queen ▁Br ün h ild . ▁In ▁Richard ▁Wagner ' s ▁opera ▁cycle ▁Der ▁Ring ▁des ▁N ib el ungen , ▁the ▁clo ak ▁becomes ▁a ▁magic ▁hel met ▁called ▁the ▁T arn helm , ▁which ▁also ▁im parts ▁the ▁ability ▁to ▁transform ▁upon ▁its ▁wear er . ▁When ▁Fritz ▁Lang ▁adapted ▁N ib el ungen lied ▁for ▁the ▁movie ▁screen ▁in ▁his ▁ 1 9 2 4 ▁film ▁Die ▁N ib el ungen , ▁Sieg fried ▁uses ▁a ▁ve il ▁or ▁net ▁of ▁in visibility ▁gained ▁from ▁the ▁d war f ▁Al ber ich . ▁Another ▁film ▁from ▁the ▁same ▁year ▁to ▁use ▁a ▁clo ak ▁of ▁in visibility ▁was ▁Ra oul ▁Wal sh ' s ▁The ▁Th ief ▁of ▁Bag d ad , ▁in ▁which ▁the ▁clo ak ▁plays ▁a ▁p iv otal ▁role . ▁Ed gar ▁R ice ▁B urr ough s ▁uses ▁the ▁idea ▁of ▁an ▁in visibility ▁clo ak ▁in ▁his ▁ 1 9 3 1 ▁novel ▁A ▁Fight ing ▁Man ▁of ▁Mars . ▁The ▁movie ▁Erik ▁the ▁Vik ing ▁humor ously ▁dep ict s ▁the ▁title ▁character ▁using ▁a ▁clo ak ▁of ▁in visibility , ▁which ▁he ▁does ▁not