▁amongst ▁the ▁r ar est ▁objects ▁in ▁Islam ic ▁art . ▁There ▁are ▁a ▁few ▁that ▁surv ived ▁and ▁are ▁now ▁in ▁collections ▁across ▁Europe . ▁They ▁are ▁often ▁in ▁c athedral ▁tre as uries , ▁where ▁they ▁were ▁red edic ated ▁after ▁being ▁captured ▁from ▁their ▁original ▁Islam ic ▁settings . ▁Made ▁in ▁Egypt ▁in ▁the ▁late ▁ 1 0 th ▁century , ▁the ▁e wer ▁p ict ured ▁is ▁ex quis it ely ▁decor ated ▁with ▁fant astic ▁birds , ▁be asts ▁and ▁tw isting ▁tend r ils . ▁The ▁Tre asure ▁of ▁C ali ph ▁Most ans ir - B illa h ▁at ▁C airo , ▁which ▁was ▁destroyed ▁in ▁ 1 0 6 2 , ▁apparently ▁contained ▁ 1 8 0 0 ▁rock ▁cry stal ▁vessels . ▁ ▁Great ▁skill ▁was ▁required ▁to ▁h ollow ▁out ▁the ▁raw ▁rock ▁cry stal ▁without ▁breaking ▁it ▁and ▁to ▁car ve ▁the ▁del icate , ▁often ▁very ▁shall ow , ▁decor ation . ▁ ▁F at im id ▁architecture ▁ ▁In ▁architecture , ▁the ▁F at im ids ▁followed ▁Tul un id ▁techniques ▁and ▁used ▁similar ▁materials , ▁but ▁also ▁developed ▁those ▁of ▁their ▁own . ▁In ▁C airo , ▁their ▁first ▁con greg ational ▁mos que ▁was ▁al - Az har ▁mos que ▁(" the ▁splendid ") ▁founded ▁along ▁with ▁the ▁city ▁( 9 6 9 – 9 7 3 ), ▁which , ▁together ▁with ▁its ▁adjacent ▁institution ▁of ▁higher ▁learning ▁( al - Az har ▁University ), ▁became ▁the ▁spiritual