Persistent, Niggling Questions

[Katy Jane]

Originally Posted by Nate the Great

(This one occurred to me just yesterday) How do blind people know what the top or bottom of Braille letters are? Here's a diagram (since the forum can't handle spaces properly, each O is a dot and each X is a space):

OO XX
OX OO
XX OX

Same dot configuration, but different symbol. How can they tell?

I'm guessing they would have letters before and after it to compare it too. if the top row of dots lines up with the top row of dots from the previous letter then it's the first one you show and if it doesn't then its the second one.