Recently got Mirror by Suzy Lee and absolutely love it.
This is the description Amazon provides, which I full heatedly agree with:

Stunning in its simplicity and grace, Mirror is visual tour-de-force that requires no words to tell its universal tale. Author and illustrator Suzy Lee masterfully creates a world where a little girl explores and dances — at first cautiously, later exuberantly — with her reflection in the mirror. When discord between the girl and her reflection surfaces, Lee's unforgettable story provides a gentle reminder that our actions have consequences. A beautiful book sure to be embraced by the many fans of Wave, Suzy Lee's Mirror strengthens her growing reputation as one of the most exciting new authors to watch.

Just as in Wave (a story that has garnered much recognition), Lee plays with the gutter of the book. In this case it is the divide between the girl's world and that of the mirror. Such artistic choices push the picture book format to new levels. Lee certainly seems to have a knack for it.

Highly recommended . . . . 4 and a 1/2 stars!