Mezue ahịrịokwu a:
N'afọ 1989, a họpụtara Sion ka ọ bụrụ osote prọfesọ na ụlọ ọrụ eserese na Academy of Fine Arts. O sonyere na nnọkọ nkwurịta okwu na Art Informel (1991) ma gosipụta ya na ihe ngosi "Czech Art Informel: Pioneers of Abstraction 1957<unk>1964". N'afọ 1993, o gosipụtara ihe ngosi na Roudnice nad Labem, The Václav Špála Gallery na Prague na Ostrava House of Art. Na 1996 Sion nwere ihe ngosi ọzọ na Rudolfinum Gallery na Prague.