Let's create some objects, a list of atoms:

lfe> (set objects '(whiskey-bottle bucket frog chain))
(whiskey-bottle bucket frog chain)

Ok, now let's dissect this line and see what it means:

Since a Lisp compiler always starts reading things in Code Mode and expects a form, the first symbol, set, must be a command. In this case, the command sets a variable to a value: The variable is objects The value we are setting it to is a list of the four objects in our game. Now, since the list is data (i.e. we don't want the compiler to try and call a function with the name of whiskey-bottle) we need to "flip" the compiler into Data Mode when reading the list. The single quote in front of the list is the command that tells the compiler to flip: