The speaker watches a boy who seems at home wherever he is. He stands with calm interest, absorbed in something he loves, and that ease makes him look like he belongs even in places where you might not expect him. The speaker is drawn to him, describing his soul as a "spiraling galaxy," something huge and beautiful to look at.
What stands out is the speaker's mixed feelings. She wants to capture the moment, but then decides she would rather simply live in it. Admiration slides into distance, though. She sees him as someone she can only watch "from afar," while she feels grey beside the colour of his simplicity. He belongs; she doesn't.
The poem ends with quiet longing. She sits and waits, hoping he might wrap her in himself and teach her how to exist the way he does. The mood is tender, wistful, and a little lonely, a crush mixed with the wish to feel at peace in oneself.