How is `if` related with creating a new line? And how does new line make something 2D? If code was 2D you could write code anywhere in your document without juggling around spaces and newlines

Mathematicians like to use parametrizations to measure "how |any dimensions" something has. If you need two indexes to traverse it (x and y), it's 2d, if a single index works best to describe it, it's 1d.

Another way to think of it is "there is semantic meaning to 'the character to the right/left of this one', but is there to 'the character above/below this one'?" In most programming languages, there isn't at all.