The earliest example of equine footwear we have is made of animal hide and dates from about 600 B.C. This primitive hoof protector looks more like a horse bootie than what we think of today as a horseshoe. It was probably stuffed with dried grass or other available natural material and tied on with hide thongs.
The spiral model is a software development process combining elements of both design and prototyping-in-stages, in an effort to combine advantages of top-down and bottom-up concepts. The spiral model was defined by Barry Boehm in his article A Spiral Model of Software Development and Enhancement from 1985. This model was not the first model to discuss iterative development, but it was the first model to explain why the iteration matters.
shots of Spiral Jetty is a sequence of images of the artist running on the sculp-ture. Reaching the innermost point, Smithson gazes out at the spiral path, lake, and mountains. Spiral Jetty serves as a site from which to view the surroundingsâ the prehistoric environment that Smithson selected for it. Robert Smithson Spiral Jetty, 1970 Robert Smithsonâs Spiral Jetty, located at Rozel Point on the northeastern shore of Great Salt Lake in Utah, is one of the most remarkable examples of Land art. In 1970, assisted by a crew operating dump trucks, a tractor, and a front loader,