 How do humans perceive the transportation devices?
He touched the pencil-line scar behind his ear where the cylinder was buried, marveling at the power stored there, power to fling him from earth to this fourth planet of the Centaurian system in an instant. It had happened so fast that he could almost feel the warm, humid Missouri air, though he was light years from Missouri. A gray, funnel-shaped cloud of dust stood off to his left. He watched it, trying to recall what he might know about cyclones. Weather control made cyclones and other climatic phenomena on earth practically non-existent. The cloud did not move, though, except to spin on its axis rapidly, emitting a high-pitched, scarcely audible whine, like a high speed motor. He stood on a wide valley floor between two mountain ranges. Dark clouds capped one peak of the mountains on his left. Same as Earth gravity. He was here and Earth was somewhere up there. The sun burned fiercely, although he would have said it was about four o'clock in the afternoon, if this had been Earth. The wind devil also had a shadow, although the sun shone through it and the shadow was faint. He was here to investigate, to determine if this planet was capable of supporting life. He examined the wind devil as closely as he dared, but it was composed only of grains of sand. There was no core, no central place you could point to and say, here is the brain, or the nervous system. But then, how could a group of loosely spaced grains of sand possibly have a nervous system? When it changed to a cube he drew a square, a circle for a sphere, and so on. When the symbols were repeated he pointed to each in turn, excitement mounting. He became so absorbed in doing this that he failed to notice how the wind devil drew closer and closer, but when he inhaled the first grains of sand, the realization of what was happening dawned with a flash of fear.
 They are luxury goods that many have strong independent motivation to acquire
 They are only used to transport between worlds but humans wish they could be used for local travel  They are untrustworthy technology that are dangerous to implant  They are luxury goods that many have strong independent motivation to acquire  They are commodities in the current economy