ears but by other bodily sensors and sent to the brain for interpretation. It illuminated everything within thirty to forty meters around them. It was constant, like having unblinking eyes that could see in all directions at once. The images the sonar-like system sent to the brain were not interpreted as pictures, but were so recognizable that they might as well have been. Rocky outcrops from below, the route lines, fish, small crustaceans, anything at all was clearly defined. The brain also did some kind of math that neither Ari nor Ming could have done consciously. By simply concentrating on a single fish, they instantly knew its size, shape, speed, and even type. It was easy to track and catch.
Finally, there was what Kalindans called their "sixth" sense. Rather than telepathy, it allowed them to sense changes in both the planetary and even the individual organism's magnetic field. It oriented them and also revealed anything nasty that might be waiting beneath the sand or disguised in one of the reefs or rocky outcrops.
This sixth sense wasn't unusual among water-breathing races, but was unlike anything Ari and Ming had experienced before. Kalinda had long ago been relieved of any predators who could threaten Kalindans, but out in the rest of the world, where things didn't work by Kalindan rules, the sixth sense was one of their most vital abilities.
Why didn't we just rent one of those motor scooters at least as far as the border? Ming complained.
Because they didn't offer one, and we've precious little in the way of money or lines of credit, as you well know, Ari responded. Besides, I seem to remember someone telling them that it would be good to practice in Kalinda before leaving it, and that they needed the exercise.
Don't rub it in!
The hardest thing about being a Kalindan, Ari reflected, was thinking in three dimensions. Walking in a normal situation back in the Commonwealth was essentially a two-dimensional affair; he didn't look up unless someone yelled, and he concentrated on one direction at a time. To go up, he needed some kind of aid, such as stairs or a lift. This was more like being in space without the suit. He floated, not on top but within the environment, and he could rise or drop as easily as going backward or forward. To do this without a suit or suit controls was unnerving in and of itself.
It took them three days to reach the border, lazily testing out their new abilities, exploring the region, and resting in small towns along the way. Things had sufficient sameness so that Ming began to wonder how they would know that they'd crossed the border at all.
She needn't have worried.
All the senses save sight saw it as a massive brick wall. No matter how wide the spray, sonar bounced off it and gave the impression of a monstrous structure that was both solid and impenetrable. The magnetic-field sense showed it as a single solid shield. There was yet another sense—that the border was a static electromagnetic field.
But sight showed that it was not solid, but some sort of energy barrier. They could see through it, but there seemed little to see. It looked dark and murky, and if there was anything solid beyond, it was blurred and indistinct.
A small Customs station sat on a narrow rock outcrop at the end of the fluorescent "road" they had been following. Clearly, the route and the lighting stopped there, in a small boxy structure that probably provided its initial power. They discovered that the other building was a small inn and Customs processing center combined. Of course, they could easily penetrate the border at routes not covered by these stations, but non-Kalindans stuck out like sore thumbs. They couldn't buy anything or rent a room or even get a ticket without valid encoded visas. They saw that the place was deliberately overly bright on the "wall" side, probably so that anyone coming into the country would see it. Above, other "roads" for more elaborate and motorized traffic converged