When used with awareness and attention, our tools foster embodied cognition—they become extensions of our bodies or our minds. But if we stop paying attention, those tools can come to dominate our lives and we become “functional cyborgs,” or fyborgs, to use Alexander Chislenko’s evocative blend. We necessarily extend ourselves technologically with eyeglasses or canes or hearing aids, but we frequently go far beyond that to use our latest tools—particularly smartphones and similar devices—to mediate all or most of our experiences.