Final answer:
The author uses a vivid description to engage the reader in the excerpt from 'A History of the World in 100 Objects' by bringing to life the image of Horatio Herbert Kitchener from a World War I recruitment poster.
Step-by-step explanation:
The author of the excerpt from A History of the World in 100 Objects uses vivid description to engage the reader. This engaging description paints a visual picture of Horatio Herbert Kitchener from the recruitment poster through details like his uniform, finger pointing, and handlebar mustache, along with the impactful words 'Your country needs YOU.' Such vivid descriptions place the reader in the historical moment, making the content more relatable and memorable.