 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. A gray, funnel-shaped cloud of dust stood off to his left. Weather control made cyclones and other climatic phenomena on earth practically non-existent. He was here and Earth was somewhere up there. 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? 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. From one angle they were animals, from another birds, from a third they were vaguely humanoid creatures, glowering at him with primitive ferocity. These creatures were not only humanoid, but definitely human, although more slight of build than earth people. But up to now the tube and the chain was the only evidence of an advanced technology, unless the ancient inscriptions in the stone wall of the pool, and the statues lining the wall were evidences. An object like a pallet was brought, carried by four of the women. There, at the cavern entrance, the wind devil writhed and undulated in a brilliant harmony of colors.
 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