Here is an appealing problem which was raised by Victor Klee in 1973. Suppose the manager of a museum wants to make sure that at all times every point of the museum is watched by a guard. The guards are stationed at fixed posts, but they are able to turn around. How many guards are needed?
CITATION STYLE
Aigner, M., & Ziegler, G. M. (2018). How to guard a museum. In Proofs from THE BOOK (pp. 281–284). Springer Berlin Heidelberg. https://doi.org/10.1007/978-3-662-57265-8_40
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