"I don't know anyone around here who would want to cross the desert just to see the Pyramids," said the merchant. "They're just a pile of stones. You could build one in your backyard."

"You've never had dreams of travel," said the boy, turning to wait on a customer who had entered the shop.

Two days later, the merchant spoke to the boy about the display.

"I don't much like change," he said. "You and I aren't like Hassan, that rich merchant. If he makes a buying mistake, it doesn't affect him much. But we two have to live with our mistakes."

That's true enough, the boy thought, ruefully.

"Why did you think we should have the display?"

"I want to get back to my sheep faster. We have to take advantage when luck is on our side, and do as much to help it as it's doing to help us. It's called the principle of favorability. Or beginner's luck."

The merchant was silent for a few moments. Then he said, "The Prophet gave us the Koran, and left us just five obligations to satisfy during our lives. The most important is to believe only in the one true God. The others are to pray five times a day, fast during Ramadan, and be charitable to the poor."

He stopped there. His eyes filled with tears as he spoke of the Prophet. He was a devout man, and, even with all his impatience, he wanted to live his life in accordance with Muslim law.

"What's the fifth obligation?" the boy asked.

"Two days ago, you said that I had never dreamed of travel," the merchant answered. "The fifth obligation of every Muslim is a pilgrimage. We are obliged, at least once in our lives, to visit the holy city of Mecca.

"Mecca is a lot farther away than the Pyramids. When I was young, all I wanted to do was put together enough money to start this shop. I thought that someday I'd be rich, and could go to Mecca. I began to make some money, but I could never bring myself to leave someone in charge of the shop; the crystals are delicate things. At the same time, people were passing my shop all the time, heading for Mecca. Some of them were rich pilgrims, traveling in caravans with servants and camels, but most of the people making the pilgrimage were poorer than I.