 The Arantzazu reconstruction project paved the way to the establishment of the influential artistic group Gaur ('today') in the 1960s.In 1973, he presented in Bilbao's Museo de Bellas Artes (Bilbao Fine Arts Museum) his work "Serie Cosmogonica Vasca" (Basque Cosmogonic Series), which included some 19 works made in wood depicting Basque Mythology motifs.In 2008, Nestor donated this series to the Bilbao Fine Arts Museum.