"Mr. Carmack when did you see Mr. Luckey last?" "Um, um, um." "Do you know know of his whereabouts by chance?" "Can't remember the last time I talked to him." "Mr. Carmack, what is a voxel..." An hour later "...Think of a cube where any point on an outer side is expressed with an x , ycoordinate and the third, z coordinate defines a location into the cube from that side, its density, and its color. With this information and 3-D rendering software, a two-dimensional view from various angles of an image can be obtained and viewed at your computer."