Failure in their first attempt had brought a wisdom to the sentient fields of force. This time they did not rush in with pyrotechnic displays to show the wondrous power they knew. Observing patiently through the centuries, by now they knew man well. They knew his weakness, yet by making thing react with thing, he'd proved his strength. For here he was among the stars. Perhaps by now he might communicate? Perhaps, by now, he would not prostrate himself and grovel in the dust, if someone said, "Hello!" But careful, perhaps he would. There had been a man by name of Galileo, with the first crude telescope he'd made, who first saw the rings of Saturn. But not as rings, but rather in the planet's tilting, he had seen a spot of light on either side. And sometime later, when he looked again, the tilting of the planet back had made the rings edge on, and so they disappeared. He never looked again, nor told of what he'd seen; for legend had it that the god Saturn periodically devoured his own children, and this phenomenon he'd seen, if it became widely known, would be interpreted as the proof the legend was correct--and do incalculable damage to scientific inquiry. He'd known the temper of his fellow man well enough to take no chances of this kind, to note the experience in his works, perhaps discuss it with a cautious friend or two, but to add no further fuel to the raging fires of superstition that consumed men's minds and seared out possibility of rational thought. So walk with care. For superstition still is paramount, despite the fact that some men know how to reach the stars. To communicate this time, the fields of force took a sere planet, of barren, blistered rock, and with a concept made it into the garden of man's dreams. On one island, they set up a crystalline structure, a thing, this much concession to the mind of man; a tool, to amplify and clarify their thought to reach the still rudimentary but nevertheless present centers of man's mind--some certain man who might be ready to receive that thought. Placed in man's exploratory path, the waiting was not long until man found it. They had not led him to it through any intuitive change of course that he might find suspect. The explorers landed, claimed it for Earth, and went away. None among them felt any pull from the crystal tool upon the mountaintop.