Final answer:
Two postcards could focus on the social structure and economic aspect of medieval Japanese society.
Step-by-step explanation:
When visiting medieval Japan, two postcards could highlight different aspects of the society. The first postcard could depict the social structure, showing the hierarchy from the emperor and court nobles at the top, followed by the powerful shogun and the samurai. The lower rungs of the society could be represented by peasants, craftsmen, and merchants. The second postcard could focus on the economic aspect, showcasing the urban centers known as ukiyo, where the commoners engaged in literary and artistic pursuits, indulged in entertainment activities, and contributed to the rise of popular arts and culture.