All the others in the house, of whatever material--granite, porphyry, ironstone, basalt, slate, or wood--were quite simple in form within.
Some of them were plain of interior surface; others were engraved, in whole or part, with hieroglyphics.

But each and all of them had no protuberances or uneven surface anywhere.

They might have been used for baths; indeed, they resembled in many ways Roman baths of stone or marble which I had seen.

Inside this, however, was a raised space, outlined like a human figure.

I asked Margaret if she could explain it in any way.