Please do not show your pin code in public just because we show you how!
This tiny colorful matrix contains a pin code.
Can you guess what it is? Not easy, I admit, and that happens to be the purpose of the card.
But when I look at the matrix one of my personal pin codes stands out as by magic.
Banks in Europe have been using this little card to help their customers to remember pin codes for several years.You start with a blank card and pick 4 fields anywhere on the card of any color or in any pattern and write your pin code in those fields. Then you fill out the remaining fields with random numbers.
Make sure you write all the numbers the same way and try to have all the numbers from 0 to 9 appear 4 times.
Look at the card again and observe the magic. You will always know which fields contain your pin code, and nobody else will.
Why does this work?
It is thanks to our human recognition legacy and simple math. Humans forget numbers but remember patterns. There are 10,000 possible 4 digit pin codes compared to this card's more that 2 million different pin code positions. Hence the card is totally useless to a thief.
You can download and print the blank card to your left. Just right-click or apple + click anywhere on the card and choose "save as".
It includes fields for the name of the issuers and the number to call in case the card gets lost.
Keep the card separate from your plastic card!