So.. (let newdir '(nil nil) should become (let newdir (list nil nil) and creature!pos is equivalent to (creature 'pos) and you make a temporary anonymous function within a function but still give it a name (delimit, through the with command) that does the comparing. Three new things learned :).
I'll see if I can improve it some more though, might be able to do something with testing whether position + car / cadr direction would put a creature out of bounds in the world array, and then multiply the direction by -1. Not at home now, so will have to wait.
