Cika wannan jumla: Bayan
Juyin Juya Hali a 1989, an nada Sion mataimakin farfesa a cikin ɗakin zane-zane a Kwalejin Fine Arts. Ya halarci taron karawa juna sani kan Art Informel (1991) kuma an nuna shi a baje kolin "Czech Art Informel: Pioneers of Abstraction 1957<unk>1964". A cikin 1993 yana da nune-nunen baya a Roudnice nad Labem, Václav Špála Gallery a Prague da Ostrava House of Art. A cikin 1996 Sion yana da wani bita a Rudolfinum Gallery a Prague.