In 2001, at the age of 20, Demaine joined the faculty of MIT, as a professor of computer science. He was the youngest professor ever hired by the university. In 2003, he won a MacArthur genius grant. By then, he'd set aside the box pleat in favor of other work on folding. But a few years later Mooser's Train came rumbling back into his mind. He'd begun collaborating with another MacArthur fellow, the roboticist and computer scientist Daniela Rus, to design "programmable matter." They wanted to create a sheet made from interlocking panels that could turn into any object, from a sofa bed to a computer, with the push of a button. To do so, they would need a simple folding template that was versatile enough to handle many different forms. Demaine started with the box pleat.