Dynamic reconfigurable display knobs

A device for a human-machine interface, the device comprising:

• a display on a first surface of the device;
• an input interface adapted to detect one or more of touch input, rotation input, and push input directed to the device;
• a controller configured to generate control instructions based on input received from the input interface, the control instructions including display instructions for controlling output on the display;
• an output interface configured to send at least a subset of the control instructions from the controller to a receiving device, the device being removably coupled to the receiving device;
• and
• a projector for projecting light around a perimeter of the first surface of the device, wherein the controller is further configured to control the projection of light via the projector based on one or more of a status of the receiving device and user input received via the input interface.