Back in May the Swiss-based Helvetic Mint released the first coin in the world to incorporate a Nanojem crystal. These tiny slivers are microetched with text so small that it’s completely unreadable to the naked human eye, thus enabling long texts to be stored in tiny spaces. The first 99.9% pure silver coin shoe-horned the entire text of William Shakespeares highly admired tragedy Romeo and Juliet, into a space that could be hidden under the head of a match.

The second coin has now made its debut, and while it’s Nanojem has increased in size, so have its contents. Featuring that most endless of numbers, Pi, the Helvetic Mint has managed to cram a staggering one million digits of this famous number in a space just 11mm square. Even that barely scratches the surface of the largest current computation of Pi, which stands at a simply mind-boggling 10 quadrillion digits, a number so large it wouldn’t fit on the coin if every single piece of real estate on it was covered in Nanojem text. In fact, you’d need a Nanojem of over 1.2 square KILOMETRES to fit it on!!!