There are a couple points that are significant about the boy finding his own drawings in the chest.
The chest was long the repository of things important to his mother. Finding his drawings in there showed him how his mother felt about him. He had created something that his mother deemed so important that she could not throw away.
The chest was also the repository of old things, things from the past. By finding his drawings in there, it was proof that his childhood was over, a thing from the past.
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music builds motivation, & helps with concentration, depending on what you're doing/listening to, it can also help with expression/emotion. upbeat music helps us produce dopamine and serotonin.
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I just wake up in bad mood n I was very upset for what they did last night.I can't even explain it how I was made for them