With reference to FIG. 7, the picture 500 may be further partitioned into one or more slices 530 (e.g. rectangular slices). For illustrative purposes in FIG. 7, the partition of the tiles 510 is shown with solid lines, the partition of the slices 530 is show with bold, solid lines, and the partition of the bricks 520 is shown with broken lines. According to embodiments, the slices 530 may be of different sizes and one or more of the slices 30 may comprise a plurality of the tiles 510. For example, the top-left slice and bottom-right slice from among the slices 530 of FIG. 7 each include four of the tiles 510, and the top-right slice from among the slices 530 of FIG. 7 includes two of the tiles 510. According to embodiments, one or more of the slices 530 may have a size smaller than a single one of the tiles 510. For example, FIG. 7 illustrates four of the slices 530 that are each half the size of a single one of the tiles 510. According to embodiments, the tiles 510 may have any size and may contain any number of slices 530 or only a portion of a slice. According to embodiments, one or more of the tiles 510 may not be included in any of the slices 530. For example, FIG. 7 illustrates four of the tiles 510 at the bottom-left of the picture 500 that are not includes in any of the slices 530.