▁to ▁a ▁micro scop ic ▁area . ▁The ▁system ▁works ▁best ▁under ▁green ▁light . ▁In ▁addition ▁the ▁research ers ▁appear ▁to ▁be ▁optim istic ▁about ▁a ▁practical ▁clo aking ▁device ▁in ▁the ▁future : ▁ ▁Another ▁design ▁calls ▁for ▁tiny ▁metal ▁need les ▁to ▁be ▁fitted ▁into ▁a ▁hair br ush - sh aped ▁cone ▁at ▁angles ▁and ▁lengths ▁that ▁would ▁force ▁light ▁to ▁pass ▁around ▁the ▁clo ak . ▁This ▁would ▁make ▁everything ▁inside ▁the ▁cone ▁appear ▁to ▁van ish ▁because ▁the ▁light ▁would ▁no ▁longer ▁reflect ▁off ▁it . ▁" It ▁looks ▁pretty ▁much ▁like ▁fiction , ▁I ▁do ▁realize , ▁but ▁it ' s ▁completely ▁in ▁agreement ▁with ▁the ▁laws ▁of ▁physics ," ▁said ▁lead ▁research er ▁Vladimir ▁Sh ala ev , ▁a ▁professor ▁of ▁elect rical ▁and ▁computer ▁engineering ▁at ▁Pur due . ▁" I de ally , ▁if ▁we ▁make ▁it ▁real ▁it ▁would ▁work ▁exactly ▁like ▁Harry ▁Pot ter ' s ▁in visibility ▁clo ak ," ▁he ▁said . ▁" It ' s ▁not ▁going ▁to ▁be ▁heavy ▁because ▁there ' s ▁going ▁to ▁be ▁very ▁little ▁metal ▁in ▁it ." ▁ ▁Further fur ther more , ▁on ▁April ▁ 3 0 , ▁ 2 0 0 9 , ▁two ▁teams ▁of ▁scient ists ▁developed ▁a ▁clo ak ▁that ▁rendered ▁objects ▁invisible ▁to ▁near - inf ra red ▁light . ▁Un like ▁its ▁prede cess ors , ▁this ▁technology ▁did ▁not ▁util ize ▁met als , ▁which ▁impro ves ▁clo aking ▁since ▁met als ▁cause ▁some