This phrase from the Greek philosopher Diogenes translates more or less to ‘it is solved by walking’. And, indeed, there is something about walking that helps both clear the mind and think clearly.

Try a walk to get a different perspective on a problem when you’ve been banging your head against one sat at your desk. Or try a walking a meeting with the bonus that you get a bit of exercise in too.

Solvitur ambulando

This is the idea that people across history budget on average about an hour a day for traveling. Originally observed by Yacov Zahavi, it came from the observation that even as our means of transport sped up, instead of traveling less each day we would just travel further. As in the sketch, this leads to a conclusion that the size of our cities increases partly according to how efficiently we can travel in and out—they generally increase to a size that maintains about an hour round-trip journey.

Cesare Marchetti observed that Greek villages and ancient walking cities, for example, as marked by ancient city walls, tend to share a radius of about 2.5km. Walking at a typical 5km/hr that makes an hour round trip journey. He also pointed out that: “Even people in prison for a life sentence, having nothing to do and nowhere to go, walk around for one hour a day, in the open.”

Unfortunately, if you live in London, the average round-trip seems to be an exception of 1h30.

This is also known as the constant travel time budget hypothesis.

Also see isochrones. It might be interesting to look at these according to transport method…

Image adapted from: Marchetti, C., 1994: Anthropological Invariants in Travel Behavior, Technological Forecasting and Social Change , 47 :75–88, Internal Publication, International Institute for Applied Systems Analysis.

Marchetti’s constant

So maybe this was always obvious to you, but someone showed me this when I was in my 30s and it was hard for me to believe that it took 30 years for me to learn it. So, now you know. A simple tip to stop your bag coming undone — particularly if you’re walking or running and you’ve stuffed it too full like I do.

Zip backpacks to the side

I think it would be interesting if we could see the real shape of your favourite crossing marked on the road. It’d probably help more people cross and traffic get stopped less. And, hopefully, no casualties.

Our senses are built to take in information at human pace

The real shape of a crossing

Sure the big city is worse than the country. But the reality is back streets in a big city are significantly better than the busy streets in a big city, and air pollution changes massively even for small children down at the height of exhausts versus adults standing higher. So if you’re not about to move to the country you could help yourself a lot nonetheless by taking the back streets (I read this premise in Focus magazine, but can’t find an online link to reference).

Pollution is highly localized: take the back streets

I believe I first heard this on a Radiolab episode, but I can’t remember for sure. Since hearing it, I’ve reflected on it many times and can’t help but think there’s some truth in it. For me it’s kind of why we’re just not that good at processing the scenery whizzing by from a car or train, and why cycling and walking are just about the best ways of getting around. Alain de Boton, in The Art of Travel, has some great observations about why trains are so great for thinking which I think has a lot to do with this - we have time to think, with a helpful intermission of the  semi-connected landscape and houses passing by that we can only process for so long before we turn back to our thoughts. I love trains.

By moving the rubbing from sock-to-foot, to sock-to-sock.

Two socks helps prevent blisters

Took me a long time to figure out why we regularly took a different route to and from certain places. I find that it also happens cycling due to avoiding difficult cross-traffic turns.

Sketchplanations tagged with walking