1. A computing system comprising: an infrared (IR)-absorbing surface that is disposed approximately horizontally; an IR camera disposed above and pointed at the IR-absorbing surface to capture an IR image representing an object disposed between the IR camera and the IR-absorbing surface based on IR light reflected by the object; an RGB camera to capture an RGB image representing the object disposed between the RGB camera and the IR-absorbing surface; a depth camera to capture a depth image representing the object disposed between the depth camera and the IR-absorbing surface; a segmentation engine to determine a segmentation boundary representing at least one outer edge of the object based on the IR image, the depth image, and the RGB image, wherein the segmentation boundary is determined independent of any prior image of the object captured by any of the IR, depth, and RGB cameras; a projection assembly to project visible images on the IR-absorbing surface and the object; wherein the segmentation engine is to determine the segmentation boundary representing the at least one outer edge of the object based on the IR, depth, and RGB images captured during the projection of the visible images; and wherein the IR-absorbing surface further comprises a touch-sensitive region to detect physical contact with the touch-sensitive region.