What are these?

Eleanor Tauber, one of the Early Birders, sent a photo she took of the two strange objects [above] she encountered in Central Park day before yesterday. She wondered what they were. In case you too have encountered something of the like, about the size of a large orange or a small grapefruit and looking like a yellow-green brain, here is my answer:

Those are the non-edible fruit of the Osage Orange tree. I once saw them on sale at a Green Market somewhere as an anti-cockroach remedy. [Don't think it works.]