A team at Bristol University is using focused ultrasound to create 3D shapes out of air that can be seen and felt. For the visual effect the apparatus is directed at oil. The end result is a 3D haptic shape in mid-air.
The implications for this device are infinite. The current speculation of uses ranges from allowing surgeons to feel a tumor from a CT scan to projecting adjustable knobs in a call allowing drivers to better keep their eyes on the road. This of course has great implications for accessibility as well. Producing something that is both visual and tactile could have great benefits for people with vision disabilities.