Beautiful
This thread is odd, but that's what makes it beautiful. It's a little frayed, it's a little miscolored, but that's what makes it appealing to you.
If something is a bit odd, it's usually beautiful in its own way, just like this beautiful thread.
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You take this beautiful thread and lock it up with a key (き). You want to keep it all to yourself, you want its beauty to be for your eyes only!
To remember that there's a beautiful thread hidden away, you tie a not-as-beautiful thread to the end of the key.