The book's strong critique of wartime invasions, inequality among nations and interpersonal prejudices, and the contrast set off by the key symbolism of the tangerine and the orange, are particularly moving.
書中傳達出對侵略戰爭、對國與國之間的不平等，以及人與人之間的歧視的強烈批判，在「橘／橙」的關鍵象徵烘托下，格外令人動容。