Lots of cool stuff in this field. They are "ultrasonic tweezers" and ultrasonic should be in the title (of og article) to give more information and lead people

Lots of cool stuff in this field. They are "ultrasonic tweezers" and ultrasonic should be in the title (of og article) to give more information and lead people in the right direction. https://www.sciencedirect.com/science/article/abs/pii/S0301562919313973 https://www.sciencedirect.com/science/article/abs/pii/S03015... https://hackaday.com/2021/03/19/surfs-up-a-styrofoam-ball-rides-the-waves-to-create-a-volumetric-display/ https://hackaday.com/2021/03/19/surfs-up-a-styrofoam-ball-ri...