▁by ▁clo aking ▁issues ▁are ▁die lect rics . ▁These ▁non con duct ing ▁materials ▁( die lect rics ) ▁are ▁used ▁for ▁a ▁car pet ▁clo ak , ▁which ▁serves ▁as ▁an ▁optical ▁clo aking ▁device . ▁According ▁to ▁the ▁lead ▁investig ator : ▁ ▁Furthermore , ▁a ▁new ▁clo aking ▁system ▁was ▁announced ▁in ▁the ▁beginning ▁of ▁ 2 0 1 1 ▁that ▁is ▁effective ▁in ▁visible ▁light ▁and ▁h ides ▁macro scop ic ▁objects , ▁i . e . ▁objects ▁that ▁can ▁be ▁seen ▁with ▁the ▁human ▁eye . ▁The ▁clo ak ▁is ▁constructed ▁from ▁ordinary , ▁and ▁easily ▁obtain able ▁cal cite . ▁The ▁cry stal ▁consists ▁of ▁two ▁pieces ▁configured ▁according ▁to ▁specific ▁parameters . ▁The ▁cal cite ▁is ▁able ▁to ▁ref ract ▁the ▁light ▁around ▁a ▁solid ▁object ▁position ed ▁between ▁the ▁cry st als . ▁The ▁system ▁emp lo ys ▁the ▁natural ▁b ire fr ing ence ▁of ▁the ▁cal cite . ▁From ▁outside ▁the ▁system ▁the ▁object ▁is ▁not ▁visible ▁" for ▁at ▁least ▁ 3 ▁orders ▁of ▁magnitude ▁larger ▁than ▁the ▁w avel ength ▁of ▁light ▁in ▁all ▁three ▁dimensions ." ▁The ▁cal cite ▁solves ▁for ▁the ▁limitations ▁of ▁attempting ▁to ▁clo ak ▁with ▁met all ic ▁inclus ions ▁- ▁this ▁method ▁does ▁not ▁require ▁a ▁nan of ab ric ation ▁process ▁as ▁has ▁become ▁necessary ▁with ▁the ▁other ▁methods ▁of ▁clo aking . ▁The ▁nan of ab ric ation ▁process ▁is ▁time ▁cons uming ▁and ▁limits ▁the ▁size ▁of ▁the ▁clo aked ▁region