I make a fair amount of jigs and fixtures in order to provide a higher degree of precision in woodworking. This image shows the construction of a jig that will hold crown molding stock on my chop saw so that I can make very precise miter cuts.
The beauty of using these kinds of guides is not just precision, but also repeatability. The eighth cut will be exactly the same as the first. Or the twenty-third.
The cuts I am making with this jig will be center stage in the kitchen for years to come, so I want them to be perfect.