Pi to 50 decimal places appears on the crown of this hat. The pattern makes a cozy beanie, or a fez if you felt it!

Thanks to Jaxbuni for the use of her Pi Mitts chart!

I used a mystery pure new wool (approximately half a skein of each colour) for the original: the pattern contains suggestions for suitable alternatives. If you try any of these, let me know how it works out. Ahem.

Fun Facts About Π:

1. 50dp is overkill. Only 39 decimal places of Π are required to calculate anything to redundant levels of precision - for example, you could navigate across the known universe and be no more than one atom’s width from your intended destination at the end. More than my satnav can manage…

2. The Guinness World Record for memorising Π is held by Lu Chao - 67,890 digits. Some people really have nothing better to do.

3. Π is known to 10 trillion dp - calculated by Shigero Kondo in October 2011, using an ordinary home computer. Mr Kondo was unavailable to comment at his parents’ basement, as he was waiting for a pizza delivery.