The "magic" is in wrap-session, which adds the session middleware to your stack.

At that point, your ring handler will see that it's request map has a
new key (:session) which is a map containing all your session
variables.

You can assoc anything into that map and it will be stored in the session.

By default, this is all stored in-memory, it's possible to use a
database instead if you specify options to wrap-session.

See (doc wrap-session) or
http://clojuredocs.org/ring/ring.middleware.session/wrap-session

>From your gist:

; The next line is using destructuring to split out the session map
into a local variable named "session".
(defn handler [{session :session, uri :uri}]
; The next line is reading the ":n" value out of the session map.
  (let [n (session :n 1)]

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