[math-fun] left vs. right

hvm writes:

I still have difficulty with left and right; for the longest time I had to stop and think about which hand I wrote with. Or ... .

While we're discussing such things, I wonder if other math-funsters have my peculiar sort of trouble with using maps: If I'm heading north, navigating is easy; if I'm heading east or west, I do the appropriate 90 degree rotation; but if I'm heading south, I can't do a 180 degree rotation, so I *pretend* I'm going north (travelling the reverse of the route I actually want to take), figure out what I need to do, and then reverse the instructions (so that left turns becomes right turns and vice versa). Jim Propp