The yarn Christmas ornamemts reminded us of the hacky sack game children were playing here in the late 80s and 90s. All they need is a crocheted hacky sack and it keeps them agile, amused and can be a real test of clever thinking. A way to keep them active and fit without needing to outlay a lot of money. The video shows you how to play the game.
Shiny happy world has instructions for making hacky sacks.