Jesús Rafael Soto, ”Vibrations Métalliques” 1969 Titled on the publisher's label on the reverse, and inscribed (printed) with the work information. There also signed in black felt-tip pen: Soto 27 × 30 × 12,5 cm Mural relief: silkscreen on aluminium and metal rods on nylon threads Private Collection, North Rhine-Westphalia