Voxels are often used in computer graphics to obtain an approximation of 3D displays. A single "layer" of voxels is not a 3D display in the strict sense: if we assume that the
Despite this, voxels are very useful for map displays and other data format where such a limitation is not important.
Sometimes, true 3D displays use the word voxel to speak about a real 3D pixel. For example, one display could be able to show 512×512×512 voxels arranged in a cube.