This one requires a bit of an explanation. Where I work, the map library is in a building that has a tree pit in the middle of it. It’s not really a courtyard because you can’t go out there, just gaze at the stately maple through the window. Squirrels like to jump into the pit from above, though, to get maple helicopters and such. The walls are so sheer and relatively smooth that the squirrels can’t come out, and they come and gaze hungrily at the map collection cubicle dwellers. Eventually the landscapers lower a squirrel ladder into the tree. Sometimes more squirrels climb in by the ladder, but eventually they leave, the ladder is removed, and it’s a temporary squirrel-free zone again.
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