The young man fretfully pulling his clothes back into place had the face of a Qurayshi too, Ma’mun noticed. Most of his army now were the descendants of Berbers, converted Spaniards, even Goths. Ma’mun had been obliged to prohibit taunts of pork-eating, so sensitive were the sons of former Christians in his ranks. But this young man had no touch of the tow-brush about him, as lean and dark-faced as Ma’mun himself. He spoke, too, like a true Arab, without evasion or deference.
“Commander, the men on those ships are not Greeks, even if the ships throw out the Greek fire. Not all of them. Many are ferengis, Franks.”
Ma’mun raised an eyebrow. “How has it been permitted to you to see this? I have not seen it, and my eyes are keen enough to pick out the Rider of the Stars.” He meant the star in Orion’s sword-belt which has, invisible to all but the keenest-sighted, a tiny companion sheltered by the light of its neighbor.
The young man smiled with irritating condescension. “I have that which enables me to see better even than that.”
The guard-captain standing at the young man’s elbow stepped forward, aware that his master was on the edge of ordering the impaling-post to be set up. “The young man here, lord, is Mu’atiyah. A pupil of bin-Firnas.”
Ma’mun hesitated, pulling his beard. He himself had been named after the great Caliph of fifty years before, who had set up the great library and center of wisdom in Baghdad. He had the greatest respect for men of learning. And there was no doubt that Abu’l Qasim Abbas bin-Firnas was the glory of Cordova for his learning and his many experiments. With less impatience in his voice he said, “Show us then, the wisdom of your master.”
Smiling once more, the young Mu’atiyah pulled from his sleeve an object like a stout bottle covered in leather.
“Know,” he said, “that my master, being advanced in years, found a dimness coming upon his eyes, so that he could see only that which was further away than his own arm’s reach. For many years he had studied the science of making glass, and the stones from which it might be made. So, by accident, one day he discovered that if one looked through stones of a certain kind and shape, that which was too close for his eyes became as it were far away, so that he might read it. And, not by accident but by design, he studied many hours till he could find a glass shape that would do likewise for him, and restore to him the liberty of his books.”
“But that is to make the close far away,” replied Ma’mun. “Here we have need of the opposite.”
Again the young man smiled, again provoking Ma’mun with his display of confidence. “That is what I, Mu’atiyah, have discovered. That if one takes not one but two glasses, and looks first through one and then through the other, the far away comes close.”
Thoughtfully, Ma’mun reached over and took the leather object from the young man’s hand, disregarding a look of alarm and a sudden babble of explanation. He put it to his eye, looked a moment, lowered it.
“I see only the tiniest of images.”
“Not like that, lord, mighty one.” The young man was at least showing agitation for the first time. It was often so with the learned, Ma’mun conceded grimly. What upset them the most was not the threat of death but the fear that they would not be able to display their abilities. He allowed the young man to take the object from his hand, reverse it so that he looked through what appeared to be the neck.
“Yes, lord. On the deck of the lead ship I see a Greek, with a curled beard, standing by an image of the holy.” Ma’mun’s face twisted in disgust, and he spat ritually to avert the contamination created by any image of the divine. “But by him there is a fair-haired Frank, all in metal armor. They are arguing, pointing in different directions.”
“What are they saying?”
“My art deals with sight, not sound.”