Rocking Out

I think, if logic triumphed, there has to be a story behind a small rocking horse hanging outside a window of an apartment builing at the corner of Quicy and Ralph Avenues. But if logic triumphed, a rocking horse wouldn't end up there of all places.

What's it doing there, and did it arrive in this state and place intentionally? 

This building is at the corner of Quicy and Ralph avenues. I walk from my apartment down Quincy Ave towards the Gates J stop, which has both its gates on Gates Ave permanently closed, thinking this, if logic triumped in public transportation, should be called the Quincy J stop.