A takeaway from an article I'm working on:
"In the final analysis, both living things and human-made machines are mechanisms caused only by the basic forces known to physics; nevertheless, they are fundamentally, totally, different in nature, because of the way they come to exist.
"Like all artifacts, human-made machines are designed/planned from the top down, created according to goals carried in somebody’s nervous system; i.e., nimages. As a rule, because engineered, they are subject to reverse engineering. They are special purpose mechanisms.
"Living things, on the other hand, have none of those characteristics. Instead of top-down, they are the quintessence of bottom-up: trillions of unplanned, utterly goal-less trial-and-error events over billions of years on the part of molecules, each subject to all of the complexities of its environment. Efforts at reverse engineering, e.g. prostheses, don’t even come close. Living things are all general purpose mechanisms.
"It is truly remarkable that only the latter process could have yielded the exquisitely controlled movements of earth’s animals, including of course human beings."