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Jem, Dill, and Scout try to give Boo Radley a note by sticking it on a pole and attempting to hang the note through the window of Boo Radley's house, even though they used to never want to go near the house. What does this reveal?
This reveal that the kids are starting to view Boo Radley as human. They wanted him to come out to get to know him and get some ice cream.