▁the ▁social , ▁e colog ical , ▁econom ical , ▁environmental ▁challeng es ▁facing ▁the ▁Nord ic ▁soci eties ▁and ▁re forms ▁in ▁design ▁education . ▁In ▁ 1 9 6 7 ▁and ▁ 1 9 6 8 ▁he ▁invited ▁to ▁the ▁sem in ars ▁leading ▁think ers ▁in ▁design ▁and ▁architecture ▁of ▁the ▁time ▁including ▁Victor ▁Pap an ek , ▁Buck min ster ▁Full er , ▁Christopher ▁Alexander ▁and ▁Hans ▁Pal m st j erna . ▁He ▁also ▁published ▁their ▁lect ures ▁and ▁writ ings ▁in ▁the ▁famous ▁& / S DO ▁Magazine ▁ 2 ▁ 6 8 ▁in ▁ 1 9 6 8 , ▁which ▁has ▁been ▁recently ▁included ▁to ▁two ▁major ▁exhibition ▁of ▁the ▁cultural ▁radical ism ▁in ▁ 1 9 6 0 ' s : ▁You ▁Say ▁You ▁W ant ▁a ▁RE V OL UT ION ? ▁Records ▁and ▁Reb els ▁ 1 9 6 6 – 1 9 7 0 , ▁V & A ▁Publishing , ▁ 2 0 1 6 ▁() ▁and ▁Victor ▁Pap an ek : ▁The ▁Polit ics ▁of ▁Design , ▁Vit ra ▁Design ▁Museum , ▁ 2 0 1 8 ▁( ). ▁This ▁led ▁to ▁a ▁close ▁friendship ▁with ▁Pap an ek ▁and ▁Full er ▁and ▁later ▁active ▁co operation ▁with ▁them . ▁ ▁In ▁ 1 9 6 9 - 7 0 ▁S ot ama a ▁was ▁a ▁Vis iting ▁Professor ▁at ▁Pur due ▁University ▁( USA ) ▁by ▁the ▁inv itation ▁of ▁Professor ▁Victor ▁Pap an ek ▁and ▁was ▁a ▁close ▁collabor