Universiteit van Amsterdam. "Detailed insight into friction: How objects start to slide." ScienceDaily. ScienceDaily, 22 September 2022. <www.sciencedaily.com / releases / 2022 / 09 / 220922124451 ...

“Our idea is that by putting on this ‘magnetic coat’, we can turn any objects into a robot and control their locomotion,” says Dr Shen Yajing, who led the research team.

To see the result, click [F5]. There’s no red circle at first, but as soon as PowerPoint plays the slide, it starts to draw the circle from the top center. Feel free to experiment with the settings.