Sleeve
A mix of spirit and reason helped you invent the sleeve. Your spirit told you your arms were uncomfortable, stuck to your sides under that shirt. Reason told you that maybe, just maybe, if you made holes for your arms something good would come out of it. And that's how sleeves were born!
Your spirit and your arms are free! Imagine how unreasonable life was without sleeves. How on earth did you survive without them?!
しゅう
そで
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And without these sleeves, your arms would be so dead (そで). They'd be all exposed and defenseless!
Imagine all the ways your arms would be so dead if you didn't have sleeves. Sunburn, bug bites, miscellaneous cuts and scrapes... Just so, so dead. Good thing you've got sleeves.