Having had an ergonomist for a partner for some time, you get to learn about such things as 'relaxed hand positioning', "right and left thumb juxtapositioning" and many other useless bits of information - until of course you see it in action and go . . .""ahhhh I see now".
Just as an exercise, anyone can try this at home and you won't casue accidents or world disasters . . . and it's okay to do it in front of the kiddies as well, but - warning, it could make you feel nausious.
Sit relaxed in a chair, preferably a lounge chair, not so you sink into it, but just relaxed and sitting properly,
Place your 'relaxed' hands in your lap with your forearms just resting on your legs as if relaxing, slowly bring your hands together but not quite touching . . .
Allow your fingers to 'curl in slightly so they 'could touch' as you bring them together . . .
not trying to clasp your hands or do anything, just relaxed, open but curled hands with the fingers touching as your arms relax on your legs . . . . roll the hand up so that the two palms (hands) are facing each other . . . . notice anything yet?
If you've done it 'correctly, and not "TRIED" to force them or do anything, just notice when your right and left thumb are . . . .
The left is forward of the right, which is back from the 'center line' - so that if you draw a line "ACROSS" the two hands in the middle of them (from left to right) - the right thumb would be "just' touching the mid-line, and the left thumb would be forward of it.
They are Diagonally opposed . . .
Notice how the hands curve and form a hollow for two longish, but wide and none cylindrical items to slip in so that the hands need not 'clench' the handles . . .
Now go and grab a Playstation controller . . . try doing the same thing by holding the controller . . . You'll find you'll have to actually flex the left thumb back, thereby inducing muscle movement and tension to 'hold' it in position from the "relaxed natural position" . . Notice the right thumb has to come back as well. And the the wrist have to bend slightly from the 'relaxed position'.
Yes, boring I know, but the thing is, if you have a 360 controller handy, do the relaxed hands things again, then gently put the 360 controller in your hands while 'relaxed' . . . . note where the right and left thumbsticks are . . .
Note how the legs of the controller are not round, or straight, but actually "fill" the void in the open space of the two palms . . .
Having an ergonomist for a partner has its benefits . . . . you learn WHY things are made the way they are, and why things that are made simply to work, but are not "designed" with the human body in mind, generally cause problems for some. I learnt this from a lecture she had to give to form design students at Uni, where design must accompany ergonomic patterns in order for products to work correctly and as desired/designed
As a sweetner, just try placing your relaxed hands together and see which thumb sits on top when you lock your fingers together . . .
Now do it again but this time, make sure the opposite thumb lands on top- feels odd doesn't it, even sickly for some. That's because they are not 'designed' to do it that way, our right and left hand side of our bodies are different to each other in order for us to do what we do.
Plus we'd look real strange if both side looked and were identical. Even one arm is loinger than the other, as are your legs, etc etc etc.
Let me know how you go with the little test . . Thanks for the paitence and enjoy the day.