Steve Mould's video gives an accessible explanation and good sense of what these objects feel like: https://www.youtube.com/watch?v=sv-38lwV6vc https://www.yout

Steve Mould's video gives an accessible explanation and good sense of what these objects feel like: https://www.youtube.com/watch?v=sv-38lwV6vc https://www.youtube.com/watch?v=sv-38lwV6vc