By Colin Jeffrey December 02, 2014 Researchers have used projected ultrasound to create floating 3D shapes that can be seen and felt in mid-air (Photo: University of Bristol) View 1 Images ...

It's also possible to focus complex patterns of ultrasound in such a way as to cause air disturbance. It is this property of ultrasound that the researchers have tapped to create 3D haptic shapes ...

Computer scientists from the University of Bristol have devised a machine that generates floating 3D shapes that you can feel, but can't see. The possibilities that such a technology would enable ...

They're also expensive. Now a team of researchers from the Max Planck Institute in Stuttgart, Germany have figured out an inexpensive way to shape sound waves in 3-space, using 3D printing.

Scientists from The Hebrew University of Jerusalem have created wood ink that can be extruded into flat wooden structures, self-morphing into complex 3D shapes as they dry and shrink.