Twining is one of my very favorite colorwork techniques. I learned it quite by accident when I was first experimenting with colorwork in my knitting.
After some research, I discovered that twining is a traditional Scandinavian technique known as tvåändsstickning in Swedish and tvebandsstrikking in Norwegian. I'd like to say that this method just feels natural to me because of my Nordic heritage, but that's probably just in my head.
On one side of your work, twined knitting looks just like plain, old stockinette. On the other side, the twisted strands become a design element and you get a beautifully textured pattern.
To get an idea about how twined knitting works, here's a quick video so you can see the twisting and untwisting motion of the working yarn strands in action.
Yarn: HiKoo CoBaSi