>You can imagine Lisp grammar like Pac Man eating the dots: ᗧ••••, and there is no ghosts here. Pac Man is the function in Lisp, and the dots are arguments. After Pac Man eat up all the dots (the function is executed with all these arguments), it becames a dot: • . and a dot is able to be eaten by another Pac Man.
Simplest explanation of Lisp grammar I've read!