1.   Disconnected but arranged along a single axis, these cavities of poured concrete rise the full height of the building and provide its organizing spine.

2.   Indeed, most tombs in the Valley of the Kings consist of fewer than a dozen chambers, and these are small and laid out along a single axis.

3.   Most ancient Egyptian tombs consist of only a few chambers, and these are small and laid out along a single axis.

4.   The limitation in such designs is that each mirror in the array pivots on a single axis.