The butterfly (study) Štěpán Zavřel Original bibliographical reference Die Blumenstadt, text by Eveline Hasler, illustrations by Štěpán Zavřel, Bohem Press, Zürich, 1987 Other editions La città dei fiori, text by Eveline Hasler, illustrations by Štěpán Zavřel, Bohem Press Italia, Trieste, 2019 Technique acrylic Year 1985