For the long days of ICM 2014 lectures, and long flights to and from Seoul, some mathematical gymnastics is needed. And this is precisely what Omer Angel taught us in his recent visit. Combining gymnastic with a demonstration of parallel transport and deep insights on human physiology!
You want to move from this position
to this position
without simply rotating your hand.
Here are two video-demonstrations by some HUJI top people
Click on the picture to see the video. (The drill is a sequence of five moves and the video skipped the first.)