I know, that sounds like some Kinky S&M spinning thing, but it is actually a prety cool looking device! It is for plying a single back on its self without having to wind it into a center pull ball first. I had to share it with you guys!
There is a video of how it works here http://rakestrawspinner.com/
and it is inexpensive to buy, but I was thinking it would be a fun challenge to make one myself!