Harry Beck's 1933 Tube map. Image: Transport for London
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Using the science of peripheral vision to test the Tube map

We know how the brain processes things on the edge of its field of vision, and we can use that to analyse the quality of subway maps.

Cartography is a demanding technical skill. The best maps, those that define their subjects, can become icons of design in themselves. London’s Tube map is one of these - so much so, that it’s rare when a major city’s subway network doesn’t look to TfL’s map for inspiration.

The story goes that London Underground was sceptical of Harry Beck’s Tube map, and only produced a small run of pamphlets featuring it in 1932 as an experiment. Its immediate popularity proved that Beck’s insight - which seemed counter-intuitive to many people at London Underground - was correct. When trying to get between stations all you want is the relationship between them, not the geography above ground.

But how to represent that relationship? Beck looked to circuit diagrams, connecting stations with lines that were strictly at 90- and 45-degree angles. No curves. Ticks and diamonds (now ticks and circles) for stations and interchanges. Compared to the horror of, say, New York City’s subway map, it feels clean, and instantly comprehensible at a glance.

That’s an important thing for a subway map - people will be in situations where they need to check where they are in their journey with only a brief look, often out of the corner of their eye, while standing up in a crowded space or reacting to news from the driver of delays on another line. Sure, when entering a station there's more time to pause, gaze, and absorb, but the key to a good subway map is simple: the greatest amount of information in the shortest amount of time.

At MIT, Ruth Rosenholtz and her team from the Department of Brain and Cognitive Sciences have been working on how much humans can comprehend through peripheral vision. MIT’s in Boston, and the city recently held a competition to design a new subway map. Here’s the existing one (click images to expand):

And here’s the contest winner, submitted by Russian designer Mikheil Kvrivishvili:

There’s something about the second one that’s just better, isn’t there? But how to tell exactly what that is?

Research into peripheral vision has shown that the brain's comprehension of things outside of the point of focus is muddled. Our brains do a good job of fooling us that we have a larger field of vision than we actually have, but if you’re looking at a specific station on a subway map, information that’s further away from it gets distorted - it's a vague impression of colour and shape, but nothing more.

Rosenholtz and her team have created visualisations they call “mongrels” that simulate what the brain actually sees when it looks at a map, as a way of verifying the quality of a map’s design. The better the map, the less information gets lost in the mongrelisation. It's as close as you can get to a snapshot of what humans truly see when they glance at a map in the setting of a subway train.

Here’s the mongrel for Boston’s existing map, for someone who's focusing on the Kendall/MIT stop on the red line:

And here’s the mongrel for the map contest winner, focused on the same station:

Now it's possible to see why the new map is better. The silver line fades into the white background in both, which isn’t great, but the parallel layout of the lines and the greater space between station names makes it possible to still work out the structure of the system without everything washing out. Simply put, at a glance, the second map always gives you the full system and your place within it, and the first one doesn't.

I emailed Rosenholtz about these maps, and she and her team very kindly produced a similar mongrelisation of the Tube map for us. Here it is:

Turns out, it’s not too bad! It’s centred on Oxford Circus, and everything around it out to the Circle line and beyond, along the lines that have been around for decades, looks pretty good. It's a much bigger network than Boston's so everything is necessarily a bit smaller, but that's unavoidable.

The problem areas look to be the newer additions to the network - the DLR is a mess, and the Overground doesn’t really stand out. In 2015, as the first phase of Crossrail goes into action and TfL takes over the commuter rail lines running through Hackney, that bit of the map is going to look even more complicated and could become more of a mess (and transport blogger Diamond Geezer’s post on this is quite good on this). The Tube map has had things added to it over the years around the edges without the central section really being tweaked in kind, and it might be time to consider rejigging things in the middle to make more space for the outer lines.

But still, it’s still nice to know that, even though Beck’s map turned 81 this year, its initial assumptions about map design were right on the nose.

Ian Steadman is a staff science and technology writer at the New Statesman. He is on Twitter as @iansteadman.

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This is no time for a coup against a successful Labour leader

Don't blame Jeremy Corbyn for the Labour Party's crisis.

"The people who are sovereign in our party are the members," said John McDonnell this morning. As the coup against Jeremy Corbyn gains pace, the Shadow Chancellor has been talking a lot of sense. "It is time for people to come together to work in the interest of the country," he told Peston on Sunday, while emphasising that people will quickly lose trust in politics altogether if this internal squabbling continues. 

The Tory party is in complete disarray. Just days ago, the first Tory leader in 23 years to win a majority for his party was forced to resign from Government after just over a year in charge. We have some form of caretaker Government. Those who led the Brexit campaign now have no idea what to do. 

It is disappointing that a handful of Labour parliamentarians have decided to join in with the disintegration of British politics.

The Labour Party had the opportunity to keep its head while all about it lost theirs. It could have positioned itself as a credible alternative to a broken Government and a Tory party in chaos. Instead we have been left with a pathetic attempt to overturn the democratic will of the membership. 

But this has been coming for some time. In my opinion it has very little to do with the ramifications of the referendum result. Jeremy Corbyn was asked to do two things throughout the campaign: first, get Labour voters to side with Remain, and second, get young people to do the same.

Nearly seven in ten Labour supporters backed Remain. Young voters supported Remain by a 4:1 margin. This is about much more than an allegedly half-hearted referendum performance.

The Parliamentary Labour Party has failed to come to terms with Jeremy Corbyn’s emphatic victory. In September of last year he was elected with 59.5 per cent of the vote, some 170,000 ahead of his closest rival. It is a fact worth repeating. If another Labour leadership election were to be called I would expect Jeremy Corbyn to win by a similar margin.

In the recent local elections Jeremy managed to increase Labour’s share of the national vote on the 2015 general election. They said he would lose every by-election. He has won them emphatically. Time and time again Jeremy has exceeded expectation while also having to deal with an embittered wing within his own party.

This is no time for a leadership coup. I am dumbfounded by the attempt to remove Jeremy. The only thing that will come out of this attempted coup is another leadership election that Jeremy will win. Those opposed to him will then find themselves back at square one. Such moves only hurt Labour’s electoral chances. Labour could be offering an ambitious plan to the country concerning our current relationship with Europe, if opponents of Jeremy Corbyn hadn't decided to drop a nuke on the party.

This is a crisis Jeremy should take no responsibility for. The "bitterites" will try and they will fail. Corbyn may face a crisis of confidence. But it's the handful of rebel Labour MPs that have forced the party into a crisis of existence.

Liam Young is a commentator for the IndependentNew Statesman, Mirror and others.