Striking, somber, simple, and spellbinding. A grey meditation on love and grief with concise, lyrical text and muted illustrations. Somewhat obtuse and fanciful, yet entirely emotive and evocative. As for format, this is to picture books what graphic novels are to comic book issues. It's hard to think who to recommend it to yet it's hard to imagine anyone not finding a poignant beauty in it. It's hard to know what else to say.