(defconst cell-size 5)                 ; a compile-time constant
(defconst gravity f32 0.05)            ; with its type named
(defvar current-color i32)             ; zeroed storage
(defconst rows 3)
(defconst cols 4)
(defvar grid [rows [cols u32]])        ; BSS, rows*cols*4 bytes

(defn main []
  (print cell-size) (println "")
  (print gravity) (println "")
  (print current-color) (println "")
  (print (at grid 2 3)) (println ""))