Sometimes words do the job better and the reader gets to exercise their imagination as well as, one hopes, other muscles. You can expect to find a variety here, some written by me, some by others. Naturally they will all be properly credited. In some cases you will also find one or more illustrations. In most you will find web pages that you can view and read online. As you can figure, there's no ironclad pattern to what is here so suck it and see, as the bishop said to the acress!