Answer :

In a famous place like D.C, people are constantly moving in and out, for trade, business, and security. So the theme of movement implies that we're always moving
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Movement is one of the most obvious things that a person can see in a city. A city like Washington, D.C. is particularly busy and lively. Therefore, people will be able to see a lot of movement in such a place. The movement would come from the amount of people in the streets but also from cars, business, and other sources of light and noise.

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