Whitespace can matter, but ; counts as a newline and you can have any whitespace inside an expression that you want. Typically you'll write something like:
some_function( with, lots,
of args )
but you can also use that flexibility to make your source code look like a badass fucking fractal too.
Ruth was just asking last week 'what happened to fractals'. Might run the poster containing its own source code past the teenagers I'm teaching maths to...