Subsequently, he worked in the ARS institute from 1956-1964. During those years he completed several museum exhibition designs and he also belonged to the team of interior architects who in 1954-61 made a new interior design for the Estonian Pavilion of the USSR Economic Achievements Exhibition in Moscow. After working in ARS Vello Asi continued creating exhibition designs in Estonia, as well in Moscow, London, Ulaanbaatar. In addition to interior architecture, he also did graphic design and book design, most of which consists of designing Jaan Kross's books and several architecture related books.