1. A method of displaying an image of an object placed on a surface computer, the surface computer comprising a surface, the surface computer capable of receiving multi-touch input through the surface and rendering display output on the surface, the surface computer including a scanner, the method comprising: detecting, by the surface computer, an object placed on the surface, wherein a plurality of previously scanned images are rendered on the surface, and wherein the object overlaps at least one of the previously scanned images rendered on the surface when the object placed on the surface; identifying, by the surface computer, a region of the surface upon which the object is placed; scanning, by the surface computer using the scanner, an entire scan-able portion of the surface to create a surface image; selecting, as an object image, a portion of the surface image that corresponds to the identified region of the surface; cropping the object image from the surface image; and rendering, by the surface computer, the object image on the surface, wherein the object image is rendered wholly within the identified region of the surface without modifying portions of any of the plurality of previously scanned images rendered on the surface outside the identified region.