We often imagine that we are looking at a series of isolated scenes, when in fact we have before our eyes the _disjecta membra_ of a single composition.

Take, for example, one wall-side of the tomb of Ptahhotep at Sakkarah (fig.

176).

If we would discover the link which divides these separate scenes, we shall do well to compare this wall-subject with the mosaic at Palestrina (fig.

177), a monument of Graeco-Roman time which represents almost the same scenes, grouped, however, after a style more familiar to our ways of seeing and thinking.
The Nile occupies the immediate foreground of the picture, and extends as far as the foot of the mountains in the distance.