What Is Life?

Life is the aspect of existence that processes, acts, reacts, evaluates, and evolves through growth (reproduction and metabolism). The crucial difference between life and non-life (or non-living things) is that life uses energy for physical and conscious development. Life is anything that grows and eventually dies, i.e., ceases to proliferate and be cognizant. Can we say that viruses, for example, are cognizant? Yes, insofar as they react to stimuli; but they are alive essentially because they reproduce and grow. Computers are non-living because even though they can cognize, they do not develop biologically (grow), and cannot produce offspring. It is not cognition that determines life, then: it is rather proliferation and maturation towards a state of death; and death occurs only to living substances.

Or is the question, ‘What is the meaning (purpose) of life?’ That’s a real tough one. But I think that the meaning of life is the ideals we impose upon it, what we demand of it. I’ve come to reaffirm my Boy Scout motto, give or take a few words, that the meaning of life is to: Do good, Be Good, but also to Receive Good. The foggy term in this advice, of course, is ‘good’; but I leave that to the intuitive powers that we all share.

There are, of course, many intuitively clear examples of Doing Good: by retrieving a crying baby from a dumpster; by trying to rescue someone who’s drowning. Most of us would avoid murdering; and most of us would refrain from other acts we find intuitively wrong. So our natural intuitions determine the meaning of life for us; and it seems for other species as well, for those intuitions resonate through much of life and give it its purpose.

The ceramic artist Edmund de Waal places an object in front of him and begins to tell a story. Even if the patina, chips and signs of repair of the inanimate object hint at its history, the story is told by a living observer. A living thing is an object that contains its story within itself. Life’s story is held in the genome, based in DNA. Maybe other ways for memorising the story may be discovered, but in environments subject to common chemical processes, common methods are likely to emerge.

Although we have only the example of the Earth, it shows that life will evolve to fill every usable niche, and to secure and further diversify those niches. This should not be thought of as purposeful. Life embodies a ‘plan’, but one that does not specify ends, only methods acquired iteratively. Inanimate processes can be cyclic but not iterative: they do not learn from past mistakes.

Life exists at many levels. Life is also a process through which energy and materials are transformed; but so is non-life. The difference is that the process of life is intimately linked to story it contains, whereas non-life is indifferent to the story we impose upon it. Yet life is only a story, so it can act only through matter. Therefore life is by nature a toolmaker. Its tools are potentially everything that exists, and its workshop is potentially the whole universe. So why do humans risk undermining the life of which they are part? Because they try to impose upon it a story of their own making. Yet humans, the ‘tool-making animals’, are themselves tools of life, in an unplanned experiment.

First the technical definition. Life is self-organising chemistry which reproduces itself and passes on its evolved characteristics, encoded in DNA. In thermodynamics terms, it has the ability to reduce local entropy or disorganisation, thus locally contravening the third law of thermodynamics.

But what is life really about, if anything? The two possibilities are, life is either a meaningless accident arising from the laws of physics operating in a meaningless universe, or it is a step in a planned ‘experiment’. I say ‘step’, because this cannot be the end. The current state of life is as yet too unstable and undeveloped for it to be the end. And I say ‘experiment’ because the evolutionary nature of life suggests that its future is not known. If therefore the universe itself has a purpose, it seems most likely to be to explore what the outcome of the evolutionary experiment would be.

But what will be the outcome? If, as many physicists now believe, the universe is only information, then harnessing all the resources of the universe in one giant evolutionary process could plausibly provide a useful outcome for a species clever enough to create the universe in the first place. On this interpretation, life will ultimately organise all the physical resources of the universe into a single self-conscious intelligence, which in turn will then be able to interact with its creator(s).

Life is the embodiment of selfishness! Life is selfish because it is for itself in two ways: it is for its own survival, and it is for its own reproduction. This desire is embodied in an adaptive autocatalytic chemical system, forming life’s embodied mind.

Anything that is not itself is the other; and the collection of others constitute its environment. The organism must destructively use the other to satisfy its reproductive desire, but on achieving this, it produces an additional other – but now one that also embodies its own selfish aim and the means to satisfy this aim. Therefore, even by an organism satisfying its desire, it makes the continuing satisfaction of its desires ever more difficult to achieve. A partial solution to this dilemma is for genetically-related entities to form a cooperating society.

The underlying mechanism of evolution is therefore the iteration of the embodied desire within an ever more complex competitive and social environment. Over vast numbers of iterations, this process forces some life-forms along a pathway that solves the desire for survival and reproduction by developing ever more complex and adaptable minds. This is achieved by supplementing their underlying cellular embodied chemistry with a specialist organ (although still based on chemistry) that we call its brain, able to rapidly process electrical signals. Advanced minds can collect and process vast inputs of data by ‘projecting’ the derived output back onto its environmental source, that is by acting. However advanced it might be, an organism is still driven by the same basic needs for survival and reproduction. The creative process, however, leads the organism towards an increasingly aesthetic experience of the world. This is why for us the world we experience is both rich and beautiful.