Mother's Day Reading: "Paper Menagerie" by Ken Liu

Mother's Day is coming and I have been reading stories about mothers for the 365 Short Story Challenge I've been involved in. I ran across this story by Ken Liu, which is in the archives of Fantasy and Science Fiction Magazine. (You can read it online here.)
"Paper Menagerie" is a beautiful story, nominated for both the Hugo and the Nebula Award and I don't know what won instead but this is a story that will haunt you. Check it out and then go to Liu's site to read his other stories, which have similarly been picked out for honors. He's a tremendously good writer.