1. A collaboration input/output (I/O) system comprising: a retroreflective display screen; an image system comprising at least one infrared (IR) filtered camera and at least one IR light source coupled to the respective at least one IR filtered camera and being configured to obtain silhouette images of a first sensorless input object to generate image data associated with a location and an orientation of the first sensorless input object relative to the retroreflective display screen; a transceiver configured to transmit the image data to at least one additional collaboration I/O system at least one remote location, and further configured to receive image data from each of the at least one additional collaboration I/O system, such that the display screen is configured to display the image data associated with a location and orientation of a sensorless input object associated with each of the at least one additional collaboration I/O system superimposed over a common image of visual data; a projector configured to project both the common image of visual data and the image data of the sensorless input object associated with each of the at least one additional collaboration I/O system onto the retroreflective display screen; and a beamsplitter configured to coaxially combine an input of the at least one IR filtered camera with an output of the respective at least one IR light source and an output of the projector.