Hacky Sack?

There is a group of older people who gather at the park to chat and do activities. Some of them play badminton and others play 'hackey sack' with the Chinese version of a hacky sack. It is more or less, 6 or 7 large plastic washers held together with a screw with feathers attached to it. You can see them kicking and bumping it all over the place. It's also popular with younger people. I have seen it being played indoor with a net sort of like volleyball. Without the smashes of course.

I have never tried it.. It looks like it would hurt my foot.