Bone is a foam, a responsive material with electrical properties. It converts energy from physical pressure of walking and running into electrical current which encourages bone-building cells to make the structure denser or lighter using calcium. This exchange changes as we use our bones differently over time. If you develop a limp, bones transforms & adjust to your new way of walking. I like thinking of this as I find other human-made electrical bits and bobs on the site, thinking about crossovers between materials, medium and transformation through use.