Kora's friend Melody came over last weekend. Usually they play horses with Aubrey - all three love Breyer horses. But for some reason, this weekend they decided to build this.
I was told that Melody (who left before I could get a picture of her) drew a picture of it, then she and Kora figured out how to build it with Tinker Toys and string. What is it? you might ask. It is a working catapult! See!