"This negative is the score. The print is the performance."

This memorable analogy is from Ansel Adams, one of the foremost American photographers.

From the negative captured by the camera, Ansel would experiment with cropping, dodging and burning (lightening and darkening) to create the final print.

We have a large print of moon and half dome in our hallway. It reminds me that what the camera captured directly isn't the final piece. You still have the performance to perform.

The analogy works beyond photographs. A recipe, a script, a joke, or a business idea all still need the right performance.

Prints and performances

For some obscure reason English speakers will almost always find a flip-flop to be more natural than a flop-flip, or a pitter patter of tiny feet to a patter pitter, or a tick tock to a tock tick. When the vowel changes in a reduplicative term — such as wishy washy or hip hop — it's known as ablaut reduplication and the vowels almost always follow the order I-A-O. If you say them in any other way they almost always sound weird. It's quite fun to think of examples.

I learned this neat thing from Mark Forsyth when learning about the even more surprising English grammar convention about ordering adjectives — he was explaining why we say the Big Bad Wolf (thanks ablaut reduplication) and not the Bad Big Wolf as our other grammar convention would dictate.

A possible explanation is that in making the sounds we start at the front of the mouth and move to the back and that feels slightly easier or more natural as we make the sounds. Try it!

Ablaut reduplication

The Gini coefficient, or Gini index, is a common way to gauge income or wealth inequality within a population.

The coefficient gives a single number showing how equal a distribution is. For example, in a population where everyone earns the same amount the Gini coefficient would be 0 — total equality — and in a population where one person earned all of the population's money, the Gini coefficient would be 1 (sometimes expressed as 100%) — maximum inequality. In practice all countries' Gini coefficients are somewhere in between, at around 0.25 to 0.5 after taxes.

Like any simple measure the Gini has its difficulties, like being easily misinterpreted when compared, but is still widely used. The BBC has a short piece on its history and an alternative measure called the Palma ratio.

Of course, we have some high profile zillionaires at the moment. You might like this old sketch of wealth inequality in America.

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The Gini coefficient