When exactly is "now"? Is it this second, this minute, this year - or simply "these days?" The Long Now Foundation in San Francisco encourages people to think of the current "now" in 20,000-year increments. As inspiration, they are designing and preparing to build a monumental 10,000 clock.

Stewart Brand sits, bald and smiling, at an immense conference table at the Long Now Foundation, which he founded and co-chairs. One of the group's most ambitious projects is the design and construction of a 10,000-year clock which will be housed deep within a desert cliff 3,200 meters above sea level. "One strange by-product of thinking long term," he said, "is a weird sense of optimism, of continuity, that we may be continuous for that many centuries. So that's attractive."

Long Now Plans 10,000 Year Clock

Attractive the clock will certainly be, even if bit strange - essentially three golden columns supporting a circular display disk. The clock uses digital numbers. Even non-engineers will be impressed by its complex mechanism of weights and inter-locking spheres that adorn its face.

Long Now Plans 10,000 Year Clock

The mechanism, which is the brainchild of design engineer and Long Now co-chairman Danny Hillis, will also be monumental in scale. The prototype in the picture above Stewart Brand's head is almost three meters high but the final clock may rise to almost ninety meters. He said, "A 10,000-year clock that is beautiful enough and monumental enough might serve a function like an Eiffel Tower which continues to inspire us and is rather content-free. It stands up there and is magnificent. That's all it does. And it makes you think 'Paris' and it makes you think 'Civilization' and it makes you think 'engineering at its most beautiful' and it makes people sort of proud and happy. Rockets that go the moon have the same quality. And it's referred to as 'sublime technology.'"

Long Now Plans 10,000 Year Clock

This is a mad effort to make a thing that has that quality of sublimeness that relates to duration, to time. But the clock doesn't require that. The clock just sort of says, "I'm taking 10,000 years seriously. Are you?"

It is also designed to provoke thought both today and throughout its 10 millennia life. Mr. Brand hopes it will expand our concept of the "now" beyond the phone call we're on, the election cycle we're in, the latest "greatest scientific advance of the century."

"I think the Long Now emerging these decades is partly a function of how much shorter the now has become for most of us most of the time [because of] a combination of [our] being very busy and [also] science keeps churning out new technology and the technology keeps accelerating like computer technology, bio-technology, molecular engineering all these are coming faster and faster," he said.

"And there is a sense that that is driving the pace of history. Which is very exciting. The problem is that all that immediate attention to immediate issues draws attention away from long term issues like how are we managing our culture, which is a matter of centuries. And how are we managing our relationship to nature, which is a matter of millennia. Bouncing off the future lets you think about the things that crucially important and look past the merely urgent stuff," said Mr. Brand.

When you build things with the people of the future in mind, the things themselves tend to survive calamity better. Mr. Brand offers one example. "There was an earthquake in Turkey a couple of years ago," he said, "and the collapse of so many of the commercial buildings that were built against code because people were able to buy off the officials were a terrible failure to think in earthquake time, which is centuries time. But the mosques were just fine. Because Islam is comfortable with earthquake time, it does think in thousands of years and knows there are going to be a certain number of earthquakes and builds its buildings accordingly."

The machinery and the look of the 10,000-year clock will embody the same sort of long-term thinking. Long Now executive director Alexander Rose is the artist-engineer chiefly responsible for implementing the clock design. It is a job he seems to love. "I came to this project from an industrial design background and early on in my education I was very annoyed with the way that the whole industry was about making things faster and cheaper and making more plastic and more disposable and this project was really about the opposite where all your research is about making it slower and better and using better materials. And a lot of this project is about making something that is evocative to look at. Every object has to look as good as it works and it has too work as well as it is beautiful. It's very rare to find a project where both of those things are equally valued," Mr. Rose said.