, ▁an ▁air ▁b ubble ▁is ▁blow n ▁into ▁the ▁center ▁of ▁the ▁gather ▁via ▁a ▁blow pipe , ▁thus ▁creating ▁an ▁opening , ▁the ▁future ▁be ad ' s ▁per for ation . ▁ ▁When ▁making ▁solid ▁mult il ayer ed ▁can e ▁intended ▁to ▁be ▁used ▁for ▁decor ating ▁m ille f ior i ▁be ads , ▁no ▁air ▁b ubble ▁is ▁inserted . ▁The ▁gather ▁( with ▁the ▁air ▁b ubble ▁in ▁its ▁center ) ▁is ▁pl ung ed ▁into ▁a ▁star - sh aped ▁m ould , ▁which ▁can ▁have ▁anywhere ▁between ▁five ▁and ▁fifteen ▁points . ▁ ▁Several ▁layers ▁of ▁glass ▁can ▁be ▁applied , ▁returning ▁to ▁the ▁m ould ▁as ▁desired , ▁to ▁create ▁either ▁a ▁star - sh aped ▁or ▁smooth ▁effect ▁for ▁each ▁layer . ▁After ▁all ▁layers ▁have ▁been ▁applied , ▁metal ▁pl ates ▁are ▁aff ixed ▁to ▁the ▁still ▁hot ▁glass , ▁which ▁is ▁" dra wn " ▁or ▁stretch ed ▁out ▁into ▁a ▁long ▁rod , ▁called ▁a ▁" c ane ", ▁by ▁pulling ▁from ▁both ▁ends ▁in ▁opposite ▁directions . ▁ ▁The ▁b ubble ▁at ▁the ▁center ▁of ▁the ▁gather ▁st ret ches ▁with ▁the ▁can e ▁and ▁forms ▁the ▁hole ▁in ▁the ▁be ad , ▁i . e . ▁the ▁be ad ' s ▁per for ation . ▁ ▁The ▁diameter ▁of ▁the ▁can e , ▁and ▁therefore ▁of ▁the ▁resulting ▁be ads , ▁is ▁determined ▁by ▁the ▁amount ▁of ▁glass ▁in ▁the ▁original ▁gather ▁and ▁also ▁by ▁how ▁thin