A portrait of Mark Tobey by the sculptor Ricci Riggenbach:
Bronze patinated plaster, 40 cm high, titled Mark Tobey, signed Ricci Riggenb(ach)
and dated Chexbres 64
The photo (right) shows Tobey and Riggenbach discussing the portrait in Basel 1964 (see the catalogue: Der Sammler Theodor Ahrenberg und das Atelier in Chexbres,
15 Jahre mit Kunst und Künstlern 1960 – 1975. Kunstverein Düsseldorf, 1977)
