Tranquillity: Blue is a woodblock print closely related to the 1959 color woodblock version of the same subject, the slight difference in title spelling (the double "l" in "Tranquillity" versus the single "l") possibly indicating a variant edition or a separately pulled version. Such variants were common in Uchima's practice, where the artist might rework a composition across different printings, adjusting color density, paper tone, or the number of impressions to produce subtly different results from the same conceptual starting point. The pursuit of tranquility through blue remains the governing idea, each version exploring a different register of that color-emotion relationship.