*John Horton Conway with polyhedral models in his Princeton U. office, 1993 (photo by Dith Pran for The New York Times)*

Covid-19 killed 13,000+ people last week, according to data from The Covid Tracking Project. Among them was John Horton Conway.

It was xkcd’s animated gif “RIP John Conway” that first alerted me to his death. While saddened to learn of his death, I was struck by the poetic aptness of xkcd’s [Randall Munroe’s] tribute.

At times, Conway bemoaned the popularity of his game — over his numerous other achievements in pure mathematics. Although you can also find plenty of interviews where he patiently explains the rules and implications of *LIFE*.

Like many, I’d first learned of Conway *(and “LIFE”)*, when I read Stephen Levy’s book, *Hackers: Heroes of the Computer Revolution*.

He’d described how students, working with mainframe computers at M.I.T. in the 1970s, became completely absorbed in Conway’s so-called game. Rereading that passage now, the rules of *LIFE* (highlighted below) now remind me of social distancing. Six feet apart vs. six feet under.

**The principle of isolation and crowding in ***LIFE*

*LIFE*

LIFEwas a game, a computer simulation developed by John Conway, a distinguished British mathematician. It was first described by Martin Gardner, in his “Mathematical Games” column in the October 1970 issue ofScientific American. The game consists of markers on a checkerboard-like field, each marker representing a “cell.” The pattern of cells changes with each move in the game (called a “generation”) depending on a few simple rules—cells die, are born, or survive to the next generation according to how many neighboring cells are in the vicinity. The principle is that isolated cells die of loneliness, and crowded cells die from overpopulation …[Bill] Gosper first saw the game when he came into the lab … and found two hackers fooling around with it on the PDP-6. He watched for a while. …Then he watched the patterns take shape a while longer. Gosper …appreciated how the specific bandwidth of the human eyeball could interpret patterns; he would often use weird algorithms to generate a display based on mathematical computations. What would appear to be random numbers on paper could be brought to life on a computer screen. A certain order could be discerned, an order that would change in an interesting way if you took the algorithm a few iterations further, or alternated the X and y patterns. It was soon clear to Gosper that

LIFEpresented these possibilities and more. He began working with a few AI workers to hackLIFEin an extremely serious way. He was to do almost nothing else for the next eighteen months.

It’s ironic, of course, that, because of the game’s analogies to life and death, it now seems inevitable that *LIFE* (the game) should figure so prominently in Conway’s online epitaph.

*LIFE* on an Osborne 1

*LIFE*on an Osborne 1

I’m no coder, and I’m certainly no mathematician, but like many other readers of Martin Gardner’s column, I tried my hand at writing a computer program, to see what Conway’s *LIFE* looked like in action. The computer I used was a hand-me-down Osborne 1. *(from my Mom!)*

The **Osborne 1** had a tiny black and white screen, however. And, while my first *LIFE* program, written in BASIC *did* work, the computer’s small screen size was a huge limitation. Could I improve the resolution? I remember being quite pleased with my solution at the time, but had nowhere to brag about it. Until now.

**MicroLIFE**

I noticed that, among the graphic characters available, were these 15 block elements:

█ full block

▌ left half block

▐ right half block

▄ lower half block

▀ upper half block

▖ quadrant lower left

▘ quadrant upper left

▝ quadrant upper right

▗ quadrant lower right

▙ quadrant upper left and lower left and lower right

▛ quadrant upper left and upper right and lower left

▜ quadrant upper left and upper right and lower right

▟ quadrant upper right and lower left and lower right

▚ quadrant upper left and lower right

▞ quadrant upper right and lower left

In the first version of my **Osborne 1** *LIFE* program, I wrote the code to calculate and display the iterations of each “cell” one at a time. But, by writing my code to calculate and display the status of cells in groups of 4, I was able to effectively *double* the resolution of my **Osborn 1**‘s wee, small screen. I just used these 15 “block element” characters, and I called this higher-res version, *Microlife*.

Of course, I no longer possess the floppy disk where I’d saved that code. Or the computer, capable of running it, for that matter. But I *do* still have the notebook where I first wrote it down.

Can’t make heads or tails out of it now, but I recall getting *some version* of this working. Eventually.

Looking into it now, I see that I was not the only one to make *LIFE* run on an **Osborne 1**. (Mike Spencer, for example, also did it!)

I remember working on stuff like this when I was commuting home on the L.I.R.R. from a job at Christie’s in 1989. I’d also dabbled with an **Osborne 1** Mandelbrot (fractal) set program, with similarly low-res screen results.

**Conway’s Polyhedral Impact**

But I don’t want leave the impression that I only care about Conway’s game. I love seeing those polyhedral models in Dith Pran’s 1993 photo of Conway in his office. Anyone who (hypothetically) follows this blog, knows that I am not immune to the fascinating symmetry of polyhedral models.

Like Conway, I used to read the “Mathematical Games” column in *Scientific American*. And (like Conway) I once wrote a letter to Martin Gardner. (This was around 1984. I was writing to Gardner to tell him of some polyhedral discovery I thought I’d made. He very kindly wrote back, letting me down easy. My discovery, he felt, was probably not new, since so much work had already been done in this field.)

Conway also invented a system of describing polyhedra that bears his name: Conway polyhedron notation.

The figures below are from Conway’s collaboration with Simon B. Kochen: *The Free Will Theorem*.

It has something to do with proving that certain elementary particles have free will. I can’t pretend to understand it, but these intersecting cube figures certainly caught my eye. (See also: Intersecting Milk Cartons)

Of all the online interviews with John Horton Conway, the series of videos hosted on the Simons Foundation website really stand out. They are organized, according to topics, into separate “chapters.” (The video embedded above is just the “highlights” reel.)

## Leave a Reply