Paradoxes

In the state of Chu, an armaments seller went to the market to sell spears and shields. When many people came to see him, he raised his shield and boasted to them, "My shield is the strongest in the world, and nothing sharp or sharp can Pierce it." Then, the armour-seller picked up another spear and boasted proudly: "My spear is the sharpest in the world, no matter how strong and solid it is, it can't stop a poke, as long as it hits, it will be pierced immediately!" He was so pleased that he cried out again, "Come and see, come and buy, the strongest shield and the sharpest spear in the world!" At this moment, a spectator stepped forward, picked up a spear, and then picked up a shield and asked, "What happens if you poke this shield with this spear?" "This -" the onlookers first were stunned, suddenly burst out laughing, and they all scattered. The arms-seller walked away with his spear and shield dispirited.