The ability to associate imaginary physical sensations with abstract concepts is called synesthesia. SOme people see letters in coloes. Others see the days of the week as if they were positioned in the space aorund them.

There's a widespread belief that synesthesia is rare and associated with certain mental conditions. In reality it's a universal phenomenon and a core uilding block of human cognition.

Here's a little test to see if you're capable of synesthesia: Looking at the word chocolate, are you able to sense a sound, a color, a taste? Looking at "999,999,999" do you get the feeling of something large?

What is rare, and what our culture doesn't push you to do, is to be aware of your capability for synesthesia and to try to develop it systematically.

synaesthesia is a concept that wants to show what this can be.

Secret math is a mental yoga whose goal is to retake control over our ability for synesthesia.

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