Looking for a nimble way to transport large amounts of cargo across bodies of water, Alessandro Dandini invented this “spherical rolling hull marine vessel” in 1974. The sphere contains a motor that trundles along a continuous track, which sets the hull rolling across the water. Cargo can be stored inside the sphere, in the two cabins mounted on the sides, or suspended beneath them. (The detachable cabins can also serve as life craft.) Because the sphere has a relatively low draft, it can move through the water with less drag than a conventional vessel. “It provides for a fast turnaround when loading and unloading cargo, which results in a highly efficient water transportation vessel.”