woo

(def agents '#{Penny Colin})
(def manipulables '#{ball chair})
 (def platforms '#{table chair})
 (def climbables '#{table chair})

(defn agent? [x] (agents x))
(defn manipulable? [x] (manipulables x))
(defn climbable? [x] (climbables x))
(defn platform? [x] (platforms x))