Scheme syntax highlighting

I propose a new type of syntax highlighting for scheme, to get rid of all the silly parenthesis and make the code more readable.

As a bonus, it will now be obvious to all that scheme is a toy language.

http://paste.lisp.org/+24DW

(display as -> text/html)

What's the colouring scheme? Does it cycle through a set number of colours, or are there different groups of colours for different types of functions, getting darker with increasing nesting? Should functions and arguments also be boxed, with slightly different colours? That single n looks a bit lonely.