Meet the HapticBots: a set of shape changing mobile robots that move on a table and change their height and orientation to give you feedback in VR environments. They support multiple touch points. They let users interact with VR surfaces continuously and pick up & move objects.
Must see robots & drones:
HapticBots: Distributed Encountered-type Haptics for VR with Multiple Shape-changing Mobile Robots
The above video shows how these robots can be used for all kinds of activities in VR.
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