var, value and symbol: when to pass as an argument?

[lawrenc...@gmail.com]

Let's say I do this as the REPL:

user> (def empty-vector [])

#'user/empty-vector

user> (type empty-vector)

clojure.lang.PersistentVector

user> (type 'empty-vector)

clojure.lang.Symbol

user> (type #'empty-vector)

clojure.lang.Var

So I can see the differences. However, I remain confused about when to use Symbol and when to use Var. If I write a function which takes a function as an argument, do I pass that 2nd argument a symbol, var, or unadorned? 

[lawrenc...@gmail.com]

Sorry, I posted this to the wrong mailist.