Disquisitiones Arithmeticae

I, too, admire your icon. Gosh, I love Seven. He went from clowning to serious-and-scary-and-cool-and-sad so fast. (Which I think was totally unexpected. They hired a goofy comedian, and he turned out to be amazing at serious.) And Sylv and Sophie doing their own (increasingly explosive) stunts so gleefully is sort of adorable.