tents and bridges

i know only about building tents. or perhaps more properly forming tents. tent or bridge, they have similar beginnings. they need a solid foundation, a base from which to start, so that their bodies will rise with little stress. but already the differences appear. a bridge builder needs deep foundations. a bridge builder knows it's surrounds, is in contact with the earth it will penetrate, and to some extent, is aware of the immediate earth's geology. clearly a bridge has a history of knowledge imbued in its conception and completion. on the other hand, there is little preparation for a tent. the tent builder needs little: a happy outlook, some shade from the sun, a flat piece of ground, unencumbered by debris. the tent's foundation is the same wherever it should be formed, and knows nothing of the earth's geology, and indeed has no penetration. it is pure surface. the tent builder is free to roam, and his qualities for foundations vary given many multiplying, ever changing factors. that brings us to what the bridge or tent is interested in: the bridge is not interested in the space between its poles, only in conquering this space, and eliminating a whole possibility of exploring the gully it crosses. the tent is versatility, versare to turn, moving around, engaging with space in a different order. although the tent builder knows a range of territories past and present, he is only concerned with the present set of territories. i long sometimes for the stability of the bridge builder's life.