▁realize ▁apparently ▁works ▁only ▁on ▁elder ly ▁men . ▁In ▁The ▁Lord ▁of ▁the ▁R ings , ▁Fro do , ▁and ▁the ▁other ▁members ▁of ▁the ▁Fellow ship ▁of ▁the ▁Ring , ▁were ▁given ▁clo aks ▁by ▁the ▁El ves , ▁and ▁Sam wise ▁asked , ▁" Are ▁these ▁magic ▁clo aks ?" ▁The ▁clo ak ▁given ▁to ▁Fro do ▁cam ou fl aged ▁him ▁so ▁that ▁the ▁enemy ▁could ▁see ▁" nothing ▁more ▁than ▁a ▁b ould er ▁where ▁the ▁Hob bits ▁were ." ▁ ▁Cam ou fl aging ▁clo aks ▁form ▁a ▁central ▁plot ▁element ▁in ▁Samuel ▁R . ▁Del any ' s ▁ 1 9 7 5 ▁novel ▁D hal gren . ▁ ▁Clo aks ▁of ▁in visibility ▁also ▁exist ▁in ▁the ▁Harry ▁Pot ter ▁series ▁of ▁nov els ▁by ▁J . K . ▁Row ling . ▁Harry ▁Pot ter ▁uses ▁a ▁Clo ak ▁of ▁In visibility , ▁that ▁was ▁passed ▁down ▁to ▁him ▁by ▁his ▁father , ▁to ▁s ne ak ▁into ▁forb idden ▁areas ▁of ▁his ▁school ▁and ▁remain ▁un seen . ▁It ▁is ▁later ▁revealed ▁that ▁this ▁specific ▁clo ak ▁was ▁once ▁owned ▁by ▁Death ▁himself , ▁making ▁it ▁one ▁of ▁the ▁Death ly ▁Hall ows . ▁ ▁Also ▁found ▁in ▁popular ▁fiction , ▁The ▁Secret ▁History , ▁by ▁Don na ▁T art t , ▁ 1 9 9 2 . ▁The ▁character , ▁Richard , ▁says , ▁" I ▁became ▁expert ▁at ▁making ▁myself ▁invisible " .... " S und ay ▁af tern o ons ,