Isotope

Isotope is among Toshi Yoshida's abstract mokuhanga designs from his postwar non-objective period, employing scientific terminology in the manner he often used to title these works — naming them for physical or chemical phenomena rather than subjects. The image is built from carved shapes printed in sequence rather than drawn linework, with each cherry-wood block contributing one color or tonal area to the final composition. The technique allows precise registration of overlapping forms and the controlled use of [bokashi](/glossary/bokashi) gradations within individual shapes, producing the layered, slightly luminous surface characteristic of his abstracts. Toshi sometimes incorporated mica or metallic pigment in this body of work to introduce reflective qualities that vary with viewing angle. The abstracts were a deliberate departure from the strict landscape naturalism of his father Hiroshi and aligned him with the sōsaku-hanga movement's emphasis on artist autonomy across design, carving, and printing. They were widely collected in North America during the 1950s and 1960s, where titled Japanese abstracts found a receptive audience among postwar print enthusiasts.