Floating Pixels (IMAGE) University of Sussex Caption The pixels are levitated using a series of miniature ultrasound speakers that create high-pitched and high-intensity soundwaves that are inaudible but forceful enough to hold the spheres in place. They can be spun and flipped using electric force fields. Credit Sri Subramanian / University of Sussex Usage Restrictions Please credit as described. License Licensed content Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.