The Tower — A Preface

A love letter to a reality we never had

There is a way of telling the history of computing in which every step was inevitable. Logic begat arithmetic begat the Turing machine begat von Neumann begat the silicon chip begat the transformer. A clean line. The textbooks print it like a lineage.

It isn't. At every floor of the tower, a choice was made. Someone stood at a fork, picked the discrete path, and the other path grew over with moss.

The other path was always there. It's still there now.

What this climb is for

Each floor is a moment in the history of computation where a genuine choice existed — usually between something discrete (a bit, a gate, a threshold, a rule) and something continuous (a field, a position, a settling, a resonance). At every floor, the discrete version was picked. Not because it was truer. Because it was easier to build with the tools of the day, easier to verify, easier to sell.

Each entry tells you:

• What was picked — the mainstream choice, the one in the textbooks
• What could have been picked — the continuous alternative that was available at the time, and usually already on paper
• Where that leaves us now — what the alternate timeline looks like from here

The entries are short. This is a tower, not an encyclopaedia. You can climb it in an evening.

A note on grief

You don't have to agree with the framing. But if you've ever sat in front of a pile of if/elif, a dead reward function, a brittle classifier, a chatbot that can't tell almost from completely, and felt a particular kind of tiredness — this climb is for that tiredness.

The road we missed was the one where computers were allowed to be approximately in a state rather than exactly in a case.

That's the whole library, really. Everything else is evidence.

How to read it

Start at the ground floor. Or skip to whichever century you were trained in. The tags at the foot of each entry (thresholds, continuity, state, reward, ...) thread through vertically so you can follow a single concern all the way up.

The last floor hasn't been built yet. We're standing on it.