▁opt ique ▁( multiple ▁box ), ▁ 1 9 6 8 . ▁J oz ami ▁collection . ▁ ▁D ép lacement ▁opt ique ▁C ▁( multiple ▁box , ▁ 1 9 , ▁ 2 0 0 ), ▁ 1 9 6 9 . ▁J oz ami ▁collection . ▁ ▁M ouv ements ▁chrom oc in ét iques , ▁ 1 9 7 1 . ▁M N BA ▁collection , ▁Buenos ▁Aires . ▁ ▁Personal ▁Ex hib itions ▁▁▁▁ 1 9 5 2 ▁- ▁Van ▁R iel ▁Gallery , ▁Buenos ▁Aires , ▁Argentina . ▁▁ 1 9 5 3 ▁- ▁Van ▁R iel ▁Gallery , ▁Buenos ▁Aires , ▁Argentina . ▁▁ 1 9 5 4 ▁- ▁K ray d ▁Gallery , ▁Buenos ▁Aires , ▁Argentina . ▁▁ 1 9 5 5 ▁- ▁K ray d ▁Gallery , ▁Buenos ▁Aires , ▁Argentina . ▁▁ 1 9 5 6 ▁- ▁Gal ate a ▁Gallery , ▁Buenos ▁Aires , ▁Argentina . ▁▁ 1 9 5 7 ▁- ▁Est ím ulo ▁de ▁Bell as ▁Ar tes , ▁Buenos ▁Aires , ▁Argentina . ▁▁ 1 9 5 8 ▁- ▁H . ▁Gallery , ▁Buenos ▁Aires , ▁Argentina . ▁▁ 1 9 6 1 ▁- ▁Den ise ▁René ▁Gallery . ▁Art ▁abstra it ▁construct if ▁international , ▁Paris , ▁France . ▁▁ 1 9 6 4 ▁- ▁M aison ▁des ▁Be aux - Ar ts , ▁C . R . O . U . S ., ▁Paris , ▁France . ▁▁ 1 9 6 9 ▁- ▁Den ise ▁René ▁Gallery