Pennybun is about the most fundamental property of nature -- exchange and transfer between bodies. Particles, atoms, elements, molecules, amino acids, proteins, cells make up living bodies of various sizes all in continuous, necessary exchange with their surroundings. Life has learned the path from ¨non-living¨ bodies of matter to living bodies by controlling motion of bodies that recognize each other.  This is what food and oxygen are.

Our relationship with food and modern methods of exchange and transfer are expressions of the universal truth that ¨There is no not communicating.¨ Conscious and unconscious, we are always communicating with and translating the world. We often call this ¨consumption,¨ but there is really only transfer and exchange between and among bodies at various distances. 

The modern exchange is among bodies and collections of bodies that include marketplace, home, families, communities, the internet, our phone, our neighborhoods, strangers, traffic, clothing, holidays, dinner, wrapped gifts, smiles, walking, eating, thinking, reading  -- every exchange between our own bodies with the surroundings, and most importantly -- our own minds in exchange with the physical responses our bodies have to their exchanges with the world.

This is the central focus of pennybun: our bodies translate the world with our senses and inherited and acquired learning, our brains and bodies exchange the translated information from the world into a physical response. There is a feeling translation of the physical state of the body.

The degree of give in the given properties of nature, in the universal exchange&transfer in which we participate answers the Ferris Bueller question of why we should care about how nature works. 

Continuous exchange with the surroundings is the price of identity in nature. Food and oxygen are the origins of our uniqueness, our individuality, our discernability from the world.  Food is a special exchange between living bodies and the world. Everything we eat and most of what we use to move our world originated with a living body. We cannot directly access the sun´s power like plants, nor can we eat wind or falling water. Oxygen is the key ingredient to everything we eat because oxygen helps organize proteins and oxygen gives the electrons from our food a place to rest, a temporary home on some journey home again.

The world is an exchange of which we are part forever, as constituents and history that causes the future. Whatever distant origins our universe may have are our origins as well, but we each direct the path home again with our own individual journeys and paths. Whatever follows us will be created by our exchanges.

I reject the block universe view of nature and believe the past falls away into the physical now with every physical exchange that comes into being in the physical world. The future is not physical in the pennybun model. It is a set of possibilities constrained by the laws of nature law, the values of bodies, and their history of exchange. We are continuous participants in this exchange. 

Exchange is fundamental to the physical universe. ¨Work"-- every job we are paid to do -- is ultimately directing the motion of the world in a way nature would not likely spontaneously do on its own, even in the presence of energy.

Controlling the exchanges of nature is always some version of communication, persuasion, force, messaging, signaling, recognition. This is what food is -- a directed use of potential that nature is likely to spontaneously sequester into bonds or dissipate.

What is it that life does and needs that nature would not likely spontaneously do on its own? Without continuous input of *energy*, nature will probabilistically dissipate itself, increasing distance between bodies and number and intensity of exchanges between bodies. It is likely bodies will expand into space, beyond the reach of known physical exchange.

Sometimes, light will bind bodies as an effect of recognizing a vacant home to rest in, or being recognized by a body seeking a more or less stable home situation for itself. These complex exchanges are what food and biochemistry and biology and proteins and DNA parasitize, scavenge, and harness to sustain life. Intelligent, conscious humanity has further harnessed these exchanges in an analog of harnessing beasts of burden -- by directing their motion and what they carry across space and time. Beasts of burden are light-bound bodies harnessed and directed as exchange carriers with packs that are unpacked at another end of the journey.  Light itself has become humanity´s modern exchange carrier -- its properties are assigned burdens, cargo of representation. Photon and electron become assigned messages unpacked at another end of the journey, over space and time.

Even with the presence of energy, the exchanges must be directed to reproduce and sustain light-bound bodies

The given properties of exchange can be harnessed into representing human messages to propogate exchanges across space and time, even into the future. This is so of waves and bodies. These messages are assigned to the given messages of nature, and they are translated by each of us, but not in the automatic way a tree turns to light. The tree´s automatic translation of light in its body is an inherited wisdom, an inherited code for its world exchange. It is mediated by bodies within its body, in response to light, water, other life. The plant can read and translate the sunlight but not a dictionary of words.  

These exchanges manifest the realized world from all the possible histories of the future world. I believe in an emergent future caused and constrained and made real by past exchanges. All bodies carry value -- some message that may be recognized and translated to meaning and understanding by another body. Some values are objective physical properties carried by the body -- charge, position, momentum. Some values are subjective readings and translations and approximations of what cannot be directly observed in a whole of many parts.

Living bodies are made of and sustained by continuous exchanges among non-living matter bodies within them. The non-living bodies carry given values and changing spatial locations that are recognized in their exchange spaces (cells, bloodstream, nervous system). Bread and breath and water become alive. Life knows the language of nature.

This Living Body is sustained ONLY by continuousness with its surroundings. The bodies within a Living Body require continuous inputs from the surroundings. Bread doesn´t work to keep us alive without a continuous supply of oxygen. Oxygen is how food works for us. Carbon dioxide is how food works for plants. These chemicals provide a home for a wandering electron.

When an electron finds a place to rest, a home, it does what we all do when we are safe at home: it releases unwanted energy. Life says to the electron: if you´re not going to use that leftover light, I´ll have it. I have some protons I need to move uphill over here. The electron says: go ahead and have it. I don´t want it. I just want to stay home and rest. I just want to be left alone, and not have to deal with the rest of the world. Depending on what kind of home the electron has found to rest in, it is unlikely it will be left alone for long. The world will call, as it always does, in the form of light. (Link to Bohr and Szent-Greg). The electron doesn´t get to decide or choose. It can only rest in certain configurations of nature.  Life knows the language of the electron. The language of the electron is The Periodic Table of the Elements, but life has its own language, its own rules for the elements and light.

Light carries information to the world. What does it say? Mostly, I think, some version of ¨get home.¨ Life says okay, but not yet. Not now. Let´s enjoy the journey home, and home again. Let´s see what fun we can have, what we can learn and do with this leftover potential, this light that keeps rousting the electron out of its temporary homes where it tries to rest on its way home again. Life says: why let all that light go to waste?

Light is exchange. It carries its own light-like value and message from its home, its origin, and source, which is a field https://en.wikipedia.org/wiki/Electromagnetic_field,  and it can be assigned a value and message to carry on top of its nature-given message value. Who assigns this message? Human beings. What is the message? Amplitudes of waves that are given symbolic representations so that the message may be physically carried and transmitted from one location in space and time to another place in space and time. This is a physical exchange mediated by light´s propagative properties. In the physical, measurable world, there is no other way to mediate exchange that does not include light. As far as we know, gravity works on light-bound bodies.

https://www.qrg.northwestern.edu/projects/vss/docs/communications/1-how-is-data-put-on-radio-waves.html 

From the big bang to baked bread to books to babies, from currency to kissing, from cells to senses, from metabolism to money, from faces to fashion, from music to muscles, from light to liquor -- bodies carry and recognize values that are given and assigned, converted, translated, recognized, and transformed into something new or broken down into something old.

These exchanges occur in what has been called The Three Kingdoms: Matter, Biosphere, Abstraction. Meanings of values become more abstract and subjective by conscious meaning assigners with unique histories. Disagreement 

Still, there is one uncontestable truth all must agree on: all living systems need food and air to assemble and sustain the living kingdom from the kingdom of matter and light.

We may not agree how this came to be. But no one can disagree it is not true, so that is where to begin.

Exploring why we must eat food reveals the undeniable Two Great Truths of Identity and Wholeness, and what other things we might agree on.

Some use the term ¨system" instead of ¨body.¨