Its a line. looky like y is changing and x is a point, resolting in a vertical line.
[x] : [ 1/root(2) -1/root(2) ] [x] = [ 0 0 ]
[y] [ 1/root(2) 1/root(2)] [y] [ 0 0 ]
In my mind translates to
multi dimentional plain with X having a two dimentional vector were is always (0,0)-( 0,0) because anything - itself = 0
and Y having a two dimentional vector is always ( 1/root(2) , 1/root(2) ) - (0,0)
resolting in no change along X but a liner along Y. If root(2) is a constant.
Hey what can I say , see if I got it right , thats all.