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Why do we get our best creative ideas while taking a shower?

The Limits of Human Memo

Psychologists have discovered that the number seven is actually wired into the way our brains process information. In 1956, a Harvard psychologist named George A. Miller published a famous paper proving that the human working memory can typically hold only seven items at a time, plus or minus two. This is why phone numbers were originally designed to be seven digits long, and why we easily remember information when it is broken down into small groups of seven.

The Ancient Clock in the Sky

Long before modern calendars, ancient civilizations looked to the stars to measure time. They noticed seven prominent celestial bodies moving across the night sky: the Sun, the Moon, Mars, Mercury, Jupiter, Venus, and Saturn. Because these seven objects guided their nights, ancient Babylonians divided their time into seven-day cycles. This cosmic observation is the direct reason why almost every culture on Earth today operates on a seven-day week.

A Global Cultural Phenomenon

Because of its prominence in the sky and the mind, the number seven became deeply embedded in world culture and religion. The world was created in seven days in Genesis, the Buddha took seven steps at his birth, and there are seven lucky gods in Japanese mythology. We see it in our storytelling through the Seven Wonders of the Ancient World, the seven deadly sins, and even the classic fairy tales of Snow White and her seven dwarfs.

The Mathematical Rebel

In the world of mathematics, seven is a bit of an outcast, which only adds to its mystique. It is a prime number, meaning it can only be divided by one and itself. Furthermore, it is the only number between one and ten that cannot be multiplied or divided to keep things neat; for example, you cannot divide a 360-degree circle into seven equal whole parts. This mathematical uniqueness makes the number feel distinct and mathematically "pure" to our brains.

The Perception of Luck

In a famous online poll conducted by math writer Alex Bellos, over 44,000 people were asked to name their favorite number, and seven won by a massive landslide. Because it appears so often in nature, religion, and memory, humans have assigned a feeling of safety and good fortune to it. Casinos capitalised on this psychology, making "Lucky 7" the ultimate prize on slot machines. Ultimately, the number seven is a bridge between the physical laws of the universe and the inner workings of the human mind.