I really like that I can look at this from the side of the child the shoes leave behind (I have 2 adult daughters, 1 of whom is still on a dance team, the other who does not dance) as well as the future recipient of the ballet slippers. Passing along the dream through a pair of shoes. Cool.
Upon rereading, I don't find this such a sad poem after all, Marion, as the unused ballet shoes could benefit another child whose parents might not have been able to afford a new pair of shoes for their child. Perhaps I had Hemmingway's unworn baby shoes in mind when I first read it. Or maybe it was simply a 'glass half empty' sort of day!