These balls are also known as 'Hacky Sacks'. They are filled with sand or polystyrene beads and are played by one or more players by keeping the sack off the ground without using their hands, rather like soccer moves.Very skillful. Great puzzle, thanks.
I did not know how to crochet, but believe me it is so simple and a lot quicker than knitting, but I must admit I like my knitting just as much, there is a site on the internet whom will give you such information, good luck in your quest.
SANTACLAUS
Nov 5, 2013
If you want to knit them just knot a small square and with the wool at the end thread the wool around the square and pull up the thread, and you can now see this is forming a ball and stuff the ball and then pull the yarn up tightly and low and behold you have your colourful ball.