This is a deeply strange image that, without explanation, could launch a hundred UFO theories. But the reality is remarkably easy to explain. This is a tetrahedral kite, a solid-body flying device composed of a number of tetrahedral cells connected together to create a larger form. This one in particular was constructed in the workshop of Alexander Graham Bell in 1906. He was trying to develop a kite that was large enough to carry a motor for propulsion as well as a pilot. Unfortunately, he didn’t succeed, but the experiments were cool to watch.