![](http://d2w1s6o7rqhcfl.cloudfront.net/4680-header-1510922124.jpg)
This twisting is made of a triangular profile and twisted over 120 degrees. This give an endless surface, which means that although it seems to be a tre sided object, there is only 1 side going around and around.
This twisting is made of a triangular profile and twisted over 120 degrees. This give an endless surface, which means that although it seems to be a tre sided object, there is only 1 side going around and around.