Ubiquitous computing: how Mark Weiser predicted today's world

You're reading this on a device that fits in your pocket. Plenty of people's fridges now send a notification when the temperature changes. Your car knows where you are. The front door lock can be opened from the other side of the planet. All of it has a name: the Internet of Things. But it had another name first, coined by a man who died exactly today, 27 April, 27 years ago — without having seen any of it become reality. He called it ubiquitous computing. And his name was Mark Weiser.

The scientist who named the invisible

Mark Weiser spent nearly his whole adult career at Xerox PARC — the legendary Palo Alto laboratory that, in the 1970s and 80s, invented the graphical interface, the modern mouse, the laser printer and Ethernet, among other things you still use today without knowing where they came from. Weiser joined in 1987, took over as director of the computer science laboratory in 1988 and became CTO in 1996.

In 1988 he had an idea that looked like science fiction even by PARC standards. The vision was simple to state and profound to grasp: what if computers simply disappeared?

Invisible computers everywhere

Not disappeared as in "ceased to exist" — disappeared the way writing disappeared. You don't think about letters when you read a sentence. You just read. Weiser wanted computers like that: so integrated into the environment and into everyday tasks that you'd simply use them without thinking about them. In September 1991 he published the article "The Computer for the 21st Century" in Scientific American and defined the concept that still guides a great deal of today's technology.

The line that stuck is this one: "The most profound technologies are those that disappear. They weave themselves into the fabric of everyday life until they are indistinguishable from it."

In 1991, when most of the world was still working out what a personal computer was, Weiser was describing a future with hundreds of computers per room — and not one of them asking for attention.

Tabs, Pads and Boards: the PARC prototypes

Weiser didn't stop at paper. At PARC, he and his team built physical prototypes of three categories of device they called tabs, pads and boards.

• Tabs (centimetre scale): roughly the size of a Post-It. Small, cheap objects scattered around the environment — something between what we now call a sensor and an RFID access badge.
• Pads (hand scale): the equivalent of a sheet of paper or a book. When you pick one up, you carry on with the task where you left off. When you put it down, it "forgets" you were there. He described pads in 1991. The iPad arrived in 2010.
• Boards (wall scale): large, shared, contextual displays. What we now call a smart TV or a corporate interactive whiteboard.

The idea was that in a single room you might have dozens of tabs, a few pads and one or two boards, all communicating — and all vanishing from your conscious radar while they got on with their work.

Calm technology: technology that doesn't shout

Together with John Seely Brown, PARC's director at the time, Weiser developed the concept of calm technology. The definition is elegant: technology that informs without demanding attention. That appears at the periphery of your perception when you need it and recedes when you don't.

Look around and count how many things are beeping, notifying, flashing, vibrating and asking you to look at them right now. Then think about Weiser's ideal. The gap between the two is a good part of the reason so many people turn off notifications and leave their phone face down on the table.

He was right — and the market charged the price

Weiser died on 27 April 1999, aged 46, of liver failure caused by cancer. He didn't live to see the iPhone (2007), the Arduino (2005), Google Nest temperature sensors, health-tracking wristbands, self-driving cars or the billions of IoT devices that now form the invisible infrastructure of everyday life.

The part he didn't predict — or predicted and lamented — is that most of those technologies aren't calm. They're loud. The attention business model that came to dominate the internet turned the dream of the invisible computer into a screen you check dozens of times a day without noticing you're doing it.

The architecture he described? That part is correct. Computers in everything, everywhere, talking to each other, integrating into the environment. It's only the philosophy of how we use it that didn't follow the script he had in mind.

The detail almost nobody remembers

Alongside his scientific career, Weiser played drums in an experimental band called Severe Tire Damage. In June 1993 — two years before RealAudio, three years before the first genuinely commercial webcast — Severe Tire Damage played the first live concert broadcast over the internet, using PARC's own network. A minor detail in the band's history, a significant one in the timeline of online streaming.

27 years on, and the question is still open

If you wear a smartwatch, have connected cameras at home or simply get the fridge to tell you the milk has run out, you're living inside a fragment of Weiser's vision. The question he left open isn't technical — it's philosophical: when technology finally becomes invisible, will it be calm, or just ubiquitous? Leave your thoughts in the comments. And if you enjoy these landmarks in computing history, the post on Mosaic 1.0 is cut from the same cloth — another case of technology that changed everything without its creator reaping the recognition it deserved. Yesterday we also covered the Chernobyl virus, which triggered exactly one day before Weiser died, in April 1999 — quite the week in the history of computing.