拉萨：行程由呼吸决定

The first lesson Lhasa gives a traveller has nothing to do with scenery.

The lesson is about the body.

Lhasa sits at about three thousand six hundred and fifty metres, and the oxygen in the air is roughly two-thirds of what you get on the plains.

On the day you arrive, the best plan is to do nothing.

My friend warned me right at the airport: don't walk fast, don't shower, drink plenty of water, go to bed early.

At the time I thought it was a bit much.

Half a day later, my head started aching, and twenty steps of stairs left me stopping to catch my breath.

The plateau doesn't negotiate with you; it directly changes what you can do.

That fact sets the rhythm of the whole city.

In another city you can pack your schedule full.

Here, your schedule is decided by your breathing.

The next morning I was much better.

The sky was a very deep blue, the sunlight was strong, and yet the wind was cold.

My friend said: in Lhasa, under the sun and in the shade are two kinds of weather.

In the light you have to take your jacket off; step into the shade and you immediately put it back on.

In the morning we went to the Potala Palace.

It is built on Red Hill, and visible from many parts of the city.

The white sections and the red sections were built in different periods and served different purposes.

The earliest construction can be traced back more than a thousand years.

Most of what stands today was completed around three hundred years ago.

Visitor numbers are limited and the route is fixed.

There aren't that many steps, but at this altitude, every stretch needs a pause.

In the afternoon we went to the Barkhor.

This is a circular street that runs around the Jokhang Temple.

Everyone walks in the same direction, clockwise.

This practice is called kora.

Some people carry a prayer wheel, walking and reciting at once.

My friend said many people do several circuits a day, and by five in the morning there are already people out.

We walked one circuit, about a kilometre.

Afterwards I sat down at the roadside and found I was out of breath.

The meaning of this road isn't in its length.

Its meaning is in repetition: the same road, the same direction, every day, for many years.

Someone in a roadside shop handed me a cup of butter tea.

The tea is pale white, salty, with a distinctly oily feel.

The first mouthful is unfamiliar.

The second is better.

Somewhere high, cold and short of oxygen, fat and salt are what the body actually needs.

A lot of so-called local flavour is really a product of the climate.

Two kinds of people walk the Barkhor at the same time.

Tourists move fast, phones up, stopping to photograph any good-looking doorway.

Local people move slowly and steadily, and most don't look at the shops on either side.

Two groups share one street, doing entirely different things.

This street has become fairly commercial in recent years, with plenty of shops selling things.

But come once at dawn and you see a different picture: before it's even light, people are already walking the kora.

Tourism only occupies part of this street's day.

At dusk we went back to the square below the Potala.

The lights came on, and the white walls turned a warm gold.

There were still plenty of people photographing, and some just sitting.

I thought again about that first-day headache.

In this city, your body reaches a verdict before your plans do.

You want to go fast; it says no.

It forces you to shorten your itinerary and give your attention to something nearer at hand.

On the fourth day, leaving, I realized I had got used to walking slowly, and used to that cup of tea.

If a place forces you to slow down from your very first day, would you feel restricted, or relieved?