What happens to a building around half of the time every day?
Options:
- it gets dark
- cast shadow
- face north
- target
- fall down
Please answer and provide answer explanation.

Show your work and conclude with the exact phrasing "Therefore, the final answer is [answer]." where [answer] is just the final number or expression that solves the problem.
user
Things cast a shadow half of the time every day. Building is a thing. Shadow is cast when light is blocked by the building. The final answer: cast shadow.