"what we see on the screen is competing with the version that exists in our heads." Greg: "Bill, I know there is a bug in this code block, the output is transp

"what we see on the screen is competing with the version that exists in our heads." Greg: "Bill, I know there is a bug in this code block, the output is transposed. I've been staring at it for an hour and I can't see it." (8 second pause) Bill (pointing at the screen): "You left out the second '+' in your incrementer." Greg: (dumbfounded silence)