Why Maps Are So Annoying

Let our journalists help you make sense of the noise: Subscribe to the Mother Jones Daily newsletter and get a recap of news that matters.

Quick: does this diagram have more blue squares or more red squares?

Time’s up! There are more red squares. But according to Berkeley’s Eduardo Andrade, most people overestimate the number of blue squares when they’re lumped in the middle like this. Scatter them around in different ways and you can reliably get people to guess that there are more red squares or that there are the same number of both. This makes the visual display of information important:

It is relatively easy to bias people’s visually-based estimates. As experiment 1 demonstrates, estimations of the actual proportion of winning squares differed by almost 30 percentage points when the winning-on-the-edge vs. winning-in-the-middle formats were contrasted (30.7% vs. 57.6%). Surprisingly, people are often tempted to rely on the costless and apparently ‘‘infallible’’ visual input. Experiment 2 showed that an astonishing 75% of participants in the ‘‘pictorial format only’’ condition acknowledged that they did not systematically compute the actual probabilities before making a betting decision that involved their own participation fee.

I don’t know if this is really all that surprising or not, but there you have it. In any case, this reminds me of the old chestnut about why, when you look up something in a map book, the thing you’re looking for always seems to be right on the edge, forcing you to flip back and forth between two pages. Answer: because most of the map is on the edge. The outermost 15% of a page contains half the map. The outermost 20% contains two-thirds. So the odds of finding something near the center seems like it ought to be high but in fact is surprisingly low. Thus the annoyance factor.

Via Kevin Lewis of the Boston Globe.


Headshot of Editor in Chief of Mother Jones, Clara Jeffery

It sure feels that way to me, and here at Mother Jones, we’ve been thinking a lot about what journalism needs to do differently, and how we can have the biggest impact.

We kept coming back to one word: corruption. Democracy and the rule of law being undermined by those with wealth and power for their own gain. So we're launching an ambitious Mother Jones Corruption Project to do deep, time-intensive reporting on systemic corruption, and asking the MoJo community to help crowdfund it.

We aim to hire, build a team, and give them the time and space needed to understand how we got here and how we might get out. We want to dig into the forces and decisions that have allowed massive conflicts of interest, influence peddling, and win-at-all-costs politics to flourish.

It's unlike anything we've done, and we have seed funding to get started, but we're looking to raise $500,000 from readers by July when we'll be making key budgeting decisions—and the more resources we have by then, the deeper we can dig. If our plan sounds good to you, please help kickstart it with a tax-deductible donation today.

Thanks for reading—whether or not you can pitch in today, or ever, I'm glad you're with us.

Signed by Clara Jeffery

Clara Jeffery, Editor-in-Chief

payment methods

We Recommend