She's a Jar

"She's a jar with a heavy lid."

What does that lyric by Wilco even mean?! I don't even know but it's one of my favorite lines. 

Also, 

"My face gets sick, stuck like a question unposed."

"Just climb aboard the tracks of a trains arm in my fragile family tree. And watch me floating inches above the people under me." 

What does it even mean? 

It doesn't matter because I love it so much. 

And don't ruin it for me like someone did Brick by Ben Folds. Just let me have this crazy happy lyrical mystery.