Mexican Valley (1966) is a woodblock print created as an artist's proof from the Showa period, depicting a landscape encountered during travel in Mexico. The broad, arid valleys of central Mexico — ringed by volcanic peaks, divided by maguey rows, and lit by intense high-altitude sun — offered Uchima a landscape radically different from both his Japanese heritage and his New York surroundings. The artist's proof designation indicates this is an early pull from the block, made before or outside the numbered edition, often showing the artist testing color choices and registration. Uchima's abstract rendering reduces the valley to essential planes of earth, sky, and distant mountain.