Thunder as an abstract subject invites explosive, disruptive visual energy, a departure from the contemplative stillness that characterizes much of Masaji's output. The first entry in a "Thunder" series suggests sudden force, jagged forms, and the collision of opposing pressures. In woodblock technique, the gouge can create marks of great violence, tearing through the wood surface in ways that leave rough, energetic edges in the printed impression. Masaji may have exploited this quality to convey the raw power of a thunderclap, using the physical act of carving as a direct analog to the atmospheric discharge the title names. Thunder also carries symbolic weight in Japanese culture, associated with the deity Raijin and the elemental forces that exceed human control.