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Siblings JieJie and Didi live in the desert far outside Oasis city where there mom works long hours in a factory, trying to earn enough money for their admission to the city, too. The two struggle to find food and water and talk occasionally to mom on a pay phone. Then they find an abandoned AI robot, fix it, and put it in mother mode. It becomes a surrogate mother to them. When mom is able to get away and discovers this, she is horrified.

Illustrations are in somber grays and browns, absolutely suited to the tone of the story. Pencil strokes give beautiful detail to the faces and the setting and fade out at the edges. This would be perfect for a book club discussion about AI and its role in modern life.