ings , ▁which ▁were ▁common ▁in ▁this ▁era ), ▁challeng es ▁to ▁the ▁notion ▁of ▁the ▁mind - body ▁du ality ▁which ▁led ▁Ald ous ▁H ux ley ▁to ▁experiment ▁with ▁hall uc in ogen ic ▁dru gs ; ▁concerns ▁with ▁a ▁t ension ▁between ▁a ▁scientific ▁future ▁which ▁might ▁be ▁very ▁benef icial ▁or ▁might ▁lead ▁to ▁a ▁nuclear ▁war ; ▁and ▁fear s ▁about ▁the ▁loss ▁of ▁genu ine ▁individual ▁experience ▁in ▁a ▁Bra ve ▁New ▁World . ▁Her ▁paint ings ▁since ▁ 1 9 6 1 , ▁have ▁been ▁executed ▁by ▁assist ants . ▁She ▁met icul ously ▁plans ▁her ▁composition ' s ▁design ▁with ▁prepar atory ▁draw ings ▁and ▁coll age ▁techniques ; ▁her ▁assist ants ▁paint ▁the ▁final ▁can v ases ▁with ▁great ▁precision ▁under ▁her ▁instruction . ▁ ▁R iley ▁began ▁investig ating ▁colour ▁in ▁ 1 9 6 7 , ▁the ▁year ▁in ▁which ▁she ▁produced ▁her ▁first ▁stri pe ▁painting . ▁Following ▁a ▁major ▁ret ros pective ▁in ▁the ▁early ▁ 1 9 7 0 s , ▁R iley ▁began ▁trav elling ▁extens ively . ▁After ▁a ▁trip ▁to ▁Egypt ▁in ▁the ▁early ▁ 1 9 8 0 s , ▁where ▁she ▁was ▁inspired ▁by ▁colour ful ▁hier og lyph ic ▁decor ation , ▁R iley ▁began ▁to ▁explore ▁colour ▁and ▁contrast . ▁In ▁some ▁works , ▁lines ▁of ▁colour ▁are ▁used ▁to ▁create ▁a ▁sh immer ing ▁effect , ▁while ▁in ▁others ▁the ▁canvas ▁is ▁filled ▁with ▁t ess ell ating ▁patterns . ▁Typ