--- /dev/null
+(* From: http://www.ocaml-tutorial.org/the_structure_of_ocaml_programs *)
+
+open Graphics;;
+
+let () =
+ open_graph " 640x480";
+ for i = 12 downto 1 do
+ let radius = i * 20 in
+ set_color (if (i mod 2) = 0 then red else yellow);
+ fill_circle 320 240 radius
+ done;
+ ignore (read_line ())