Filippo Tommaso Marinetti; Josef Capek. Osvobozená slova. Praga: Nakladatelé Petr a Tvrdý, 1922

“Modern dynamism and the elevation of motion as the most important principle of life and art were promoted by Filippo Tommaso Marinetti, the founder and main figure of Italian Futurism. For Marinetti's Words-In-Freedom, Capek designed a cover using a geometric motif suggesting diagonal motion in various directions. The typography of the text is left unchanged, including the fold out appendices of sound poems.”

Alena Pomajzlová. Seeing the book: the book design of Josef Capek. Praha: Kant, 2010 (p. 38)