(* written by Dwight D. McKay - September 1986 *)
(* Circle2 - from SciAm Computer Recreations column, Sept. 86 *)
(* This is a public domain demo program. Feel free to *)
(* distribute it for free; please leave this message and the *)
(* message which is displayed in the "desk" menu item in place *)
(* as that message satisfys the license agreement with OSS. *)