▁and ▁ 1 9 1 1 ▁Sal ons ; ▁and ▁publishing ▁a ▁series ▁of ▁writ ings ▁in ▁well - est ab lished ▁literary ▁journ als ▁defining ▁and ▁def ending ▁Cub ism . ▁Met z inger ▁was ▁the ▁first ▁to ▁write ▁that ▁four ▁artists ▁had ▁dismiss ed ▁traditional ▁perspective ▁and ▁felt ▁free ▁to ▁move ▁around ▁their ▁subjects , ▁studying ▁them ▁from ▁various ▁points . ▁In ▁this ▁sem inal ▁work , ▁he ▁comp ares ▁the ▁similar ities ▁between ▁the ▁paint ings ▁of ▁Pablo ▁Pic asso , ▁Georges ▁Bra que , ▁Robert ▁D ela un ay , ▁Albert ▁G le izes ▁and ▁Henri ▁Le ▁F au con nier . ▁In ▁doing ▁so ▁he ▁en unci ated ▁for ▁the ▁first ▁time ▁what ▁would ▁become ▁known ▁as ▁the ▁primary ▁characteristics ▁of ▁Cub ism : ▁the ▁not ions ▁of ▁simultane ity ▁and ▁mobile ▁perspective . ▁In ▁this ▁ 1 9 1 0 ▁text ▁Met z inger ▁str essed ▁the ▁distance ▁between ▁their ▁works ▁and ▁traditional ▁perspective . ▁These ▁artists , ▁he ▁wrote , ▁granted ▁themselves ▁' the ▁liberty ▁of ▁moving ▁around ▁objects ', ▁and ▁combining ▁many ▁different ▁views ▁in ▁one ▁image , ▁each ▁recording ▁varying ▁experiences ▁over ▁the ▁course ▁of ▁time . ▁ ▁Of ▁this ▁group , ▁only ▁Met z inger ▁and ▁Bra que ▁were ▁familiar ▁with ▁the ▁works ▁of ▁Pic asso , ▁and ▁Met z inger ▁alone , ▁familiar ▁with ▁the ▁works ▁of ▁everyone ▁in ▁the ▁group . ▁Met z inger ▁was ▁the ▁first ▁to ▁recognize ▁explicitly ▁and ▁implicitly ▁the ▁significance ▁of ▁the ▁use ▁of ▁" a ▁free