Kobaien Antique sumi inksticks ( Koboku, 古墨 )

In East Asian scholarly tradition, the inkstick ranks among the "Four Treasures of the Study" — alongside brush, paper, and inkstone — objects meant to be collected, admired, and handed down, not just used up. Kobaien's Koboku ( antique inksticks )  carries that same lineage forward: aged sumi ink, still sought by collectors today, worth owning as much as using