https://www.youtube.com/watch?v=MUt1YKtn6kM (https://www.youtube.com/watch?v=MUt1YKtn6kM)
MIT engineers have created soft, magnetic 3-D-printed structures that can transform their shape almost instantaneously by the wave of a magnet. The structures are flexible, yet strong and could be used to develop remotely controlled biomedical devices
https://news.mit.edu/2018/magnetic-3-d-printed-structures-crawl-roll-jump-play-catch-0613 (https://news.mit.edu/2018/magnetic-3-d-printed-structures-crawl-roll-jump-play-catch-0613)
Magnetic 3-D-printed structures crawl, roll, jump, and play catch