[maroonblazer]

Not only am I unable to touch two fingers behind my head with my eyes closed, I'm not able to do it in front of my head. I can easily touch my nose with my eyes closed. Is there something going on where there's one less degree of freedom with the nose, which makes it easier?

[manwe150]

Seems a reasonable hypothesis to me. I noticed I can improve or reduce accuracy in many different positions by bending arm/finger/hand at an unusual angle until it seemed that my mind was a bit less certain exactly how twisted or crooked was the final configuration, and the uncertainty would lie most strongly in the axis I expected (the most bent angle) and most accurate in the most direct axis