▁illustr ator , ▁where ▁she ▁worked ▁part - time ▁until ▁ 1 9 6 2 . ▁The ▁White ch ap el ▁Gallery ▁exhibition ▁of ▁Jackson ▁Pol lock ▁in ▁the ▁winter ▁of ▁ 1 9 5 8 ▁had ▁an ▁impact ▁on ▁her . ▁ ▁Her ▁early ▁work ▁was ▁figur ative ▁and ▁semi - im pression ist . ▁Between ▁ 1 9 5 8 ▁and ▁ 1 9 5 9 , ▁her ▁work ▁at ▁the ▁advert ising ▁ag ency ▁showed ▁her ▁ad option ▁of ▁a ▁style ▁of ▁painting ▁based ▁on ▁the ▁point ill ist ▁technique . ▁Ar ound ▁ 1 9 6 0 , ▁she ▁began ▁to ▁develop ▁her ▁signature ▁Op ▁Art ▁style ▁consisting ▁of ▁black ▁and ▁white ▁geometric ▁patterns ▁that ▁explore ▁the ▁dynam ism ▁of ▁sight ▁and ▁produce ▁a ▁dis orient ing ▁effect ▁on ▁the ▁eye ▁and ▁produces ▁movement ▁and ▁color . ▁In ▁the ▁summer ▁of ▁ 1 9 6 0 , ▁she ▁tou red ▁Italy ▁with ▁her ▁ment or ▁Maurice ▁de ▁S aus m are z , ▁and ▁the ▁two ▁friends ▁visited ▁the ▁Ven ice ▁B ienn ale ▁with ▁its ▁large ▁exhibition ▁of ▁Fut ur ist ▁works . ▁ ▁Early ▁in ▁her ▁career , ▁R iley ▁worked ▁as ▁an ▁art ▁teacher ▁for ▁children ▁from ▁ 1 9 5 7 – 5 8 ▁at ▁the ▁Con vent ▁of ▁the ▁Sac red ▁Heart , ▁H arrow ▁( now ▁known ▁as ▁Sac red ▁Heart ▁Language ▁College ). ▁At ▁the ▁Con vent ▁of ▁the ▁Sac red ▁Heart , ▁she ▁began ▁a ▁basic ▁design ▁course . ▁Later ▁she