7

The number people pick, prophets count and machines can’t stop saying. Move across the star to change how its seven points connect.

obtuse heptagram

Pick a number

Any number from 1 to 10. Don’t overthink it.

Why every AI says seven

  • There’s no right answer, so it gives the likeliest one

    A language model doesn’t choose; it continues text. Asked for a favourite or a random number, it returns whatever followed that question most often in what it learned from. That’s a measurement of people, not a preference.

  • People already say seven

    Psychologists call it the blue-seven effect: asked for a colour and a number, people overwhelmingly answer blue and seven. In one study of 558 people picking from 0 to 9, 28% chose seven. We skip the ends (too obvious), even numbers and multiples (too tidy) and five (too central). Seven is what’s left, and it already sounds lucky.

  • Models turn a habit into a rule

    Picking the most probable answer sharpens a tilt into a spike. Fine-tuning rewards confident, agreeable replies, and more and more training text is written by other models. So where people pick seven about a quarter of the time, AI models pick it most of the time, and in some tests every time.

  • It’s an impression of randomness

    People asked for a random number are performing “being random”, and the model performs an impression of that performance. If you need a real random number, ask the assistant to run code. And if you ask which number it likes best, the honest answer is that it doesn’t have one.

Sources: Ian Leslie, Aaditya Bhat, Springboards, Sutej Singh.

The week is a star

Babylonian sky-watchers saw seven lights move against the stars. Lay them out in their old order, slowest to fastest, and follow every third point: you get the days of the week.

Saturday

Seven colours, seven notes

Isaac Newton saw a continuous smear of light and split it into seven, adding orange and indigo so the rainbow would match the seven notes of the scale. Tap a colour to hear its note.

Sound plays only when you tap.

Seven across the world

Seven traditions, seven ways of counting to seven. The number keeps marking completion, rest and the sacred.

One seventh goes round

1/7 = 0.142857142857… Multiply 142857 by 1 to 6 and the same six digits come back, only starting somewhere else on the circle. Then try 7.


142857

The digits in their original order.

The regular heptagon is the first regular polygon that can’t be drawn with only a compass and straightedge. Opposite faces of a die add up to seven, and seven is the most likely roll with two dice. Seven riffle shuffles are enough to mix a deck of 52 cards properly.

In 1956 the psychologist George Miller wrote about “the magical number seven, plus or minus two”, the rough limit of items we hold in short-term memory. Later research suggests the true figure is closer to four, but the seven stuck.

Seven seconds, one fact

A new one every seven seconds, shuffled so you won’t see a repeat until the deck runs out.