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diff --git a/lisp/play/zone.el b/lisp/play/zone.el
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+;;; zone.el --- idle display hacks
+
+;; Copyright (C) 2000 Free Software Foundation, Inc.
+
+;;; Author: Victor Zandy <zandy@cs.wisc.edu>
+;;; Maintainer: Thien-Thi Nguyen <ttn@gnu.org>
+;;; Keywords: games
+;;; Created: June 6, 1998
+
+;; This file is part of GNU Emacs.
+
+;; GNU Emacs is free software; you can redistribute it and/or modify
+;; it under the terms of the GNU General Public License as published by
+;; the Free Software Foundation; either version 2, or (at your option)
+;; any later version.
+
+;; GNU Emacs is distributed in the hope that it will be useful,
+;; but WITHOUT ANY WARRANTY; without even the implied warranty of
+;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+;; GNU General Public License for more details.
+
+;; You should have received a copy of the GNU General Public License
+;; along with GNU Emacs; see the file COPYING.  If not, write to the
+;; Free Software Foundation, Inc., 59 Temple Place - Suite 330,
+;; Boston, MA 02111-1307, USA.
+
+;;; Commentary:
+
+;; Don't zone out in front of Emacs!  Try M-x zone.
+;; If it eventually irritates you, try M-x zone-leave-me-alone.
+
+;; Bored by the zone pyrotechnics?  Write your own!  Add it to
+;; `zone-programs'.
+
+;; WARNING: Not appropriate for Emacs sessions over modems or
+;; computers as slow as mine.
+
+;; THANKS: Christopher Mayer, Scott Flinchbaugh, Rachel Kalmar,
+;; Max Froumentin.
+
+;;; Code:
+
+(require 'timer)
+(require 'tabify)
+(eval-when-compile (require 'cl))
+
+(defvar zone-timer nil)
+
+(defvar zone-idle 20
+  "*Seconds to idle before zoning out.")
+
+;; Vector of functions that zone out.  `zone' will execute one of
+;; these functions, randomly chosen.  The chosen function is invoked
+;; in the *zone* buffer, which contains the text of the selected
+;; window.  If the function loops, it *must* periodically check and
+;; halt if `input-pending-p' is t (because quitting is disabled when
+;; Emacs idle timers are run).
+(defvar zone-programs [
+                       zone-pgm-jitter
+                       zone-pgm-putz-with-case
+                       zone-pgm-dissolve
+;                      zone-pgm-explode
+                       zone-pgm-whack-chars
+                       zone-pgm-rotate
+                       zone-pgm-rotate-LR-lockstep
+                       zone-pgm-rotate-RL-lockstep
+                       zone-pgm-rotate-LR-variable
+                       zone-pgm-rotate-RL-variable
+                       zone-pgm-drip
+                       zone-pgm-drip-fretfully
+                       zone-pgm-five-oclock-swan-dive
+                       zone-pgm-martini-swan-dive
+                       zone-pgm-paragraph-spaz
+                       zone-pgm-stress
+                       ])
+
+(defmacro zone-orig (&rest body)
+  `(with-current-buffer (get 'zone 'orig-buffer)
+     ,@body))
+
+;;;###autoload
+(defun zone ()
+  "Zone out, completely."
+  (interactive)
+  (and (timerp zone-timer) (cancel-timer zone-timer))
+  (setq zone-timer nil)
+  (let ((f (and window-system (selected-frame)))
+        (outbuf (get-buffer-create "*zone*"))
+	(text (buffer-substring (window-start) (window-end)))
+	(wp (1+ (- (window-point (selected-window))
+		   (window-start)))))
+    (put 'zone 'orig-buffer (current-buffer))
+    (set-buffer outbuf)
+    (setq mode-name "Zone")
+    (erase-buffer)
+    (insert text)
+    (switch-to-buffer outbuf)
+    (setq buffer-undo-list t)
+    (untabify (point-min) (point-max))
+    (set-window-start (selected-window) (point-min))
+    (set-window-point (selected-window) wp)
+    (sit-for 0 500)
+    (let ((pgm (elt zone-programs (random (length zone-programs))))
+          (ct (and f (frame-parameter f 'cursor-type))))
+      (when ct (modify-frame-parameters f '((cursor-type . (bar . 0)))))
+      (condition-case nil
+	  (progn
+            (message "Zoning... (%s)" pgm)
+	    (garbage-collect)
+	    (funcall pgm)
+	    (message "Zoning...sorry"))
+	(error
+	 (while (not (input-pending-p))
+	   (message (format "We were zoning when we wrote %s..." pgm))
+	   (sit-for 3)
+	   (message "...here's hoping we didn't hose your buffer!")
+	   (sit-for 3)))
+	(quit (ding) (message "Zoning...sorry")))
+      (when ct (modify-frame-parameters f (list (cons 'cursor-type ct)))))
+    (kill-buffer outbuf)
+    (zone-when-idle zone-idle)))
+
+;;;; Zone when idle, or not.
+
+(defvar zone-timer nil
+  "Timer that zone sets to triggle idle zoning out.
+If t, zone won't zone out.")
+
+(defun zone-when-idle (secs)
+  "Zone out when Emacs has been idle for SECS seconds."
+  (interactive "nHow long before I start zoning (seconds): ")
+  (or (<= secs 0)
+      (eq zone-timer t)
+      (timerp zone-timer)
+      (setq zone-timer (run-with-idle-timer secs t 'zone))))
+
+(defun zone-leave-me-alone ()
+  "Don't zone out when Emacs is idle."
+  (interactive)
+  (and (timerp zone-timer) (cancel-timer zone-timer))
+  (setq zone-timer t)
+  (message "I won't zone out any more"))
+
+
+;;;; zone-pgm-jitter
+
+(defun zone-shift-up ()
+  (let* ((b (point))
+	 (e (progn
+	      (end-of-line)
+	      (if (looking-at "\n") (1+ (point)) (point))))
+	 (s (buffer-substring b e)))
+    (delete-region b e)
+    (goto-char (point-max))
+    (insert s)))
+
+(defun zone-shift-down ()
+  (goto-char (point-max))
+  (forward-line -1)
+  (beginning-of-line)
+  (let* ((b (point))
+	 (e (progn
+	      (end-of-line)
+	      (if (looking-at "\n") (1+ (point)) (point))))
+	 (s (buffer-substring b e)))
+    (delete-region b e)
+    (goto-char (point-min))
+    (insert s)))
+
+(defun zone-shift-left ()
+  (while (not (eobp))
+    (or (eolp)
+	(let ((c (following-char)))
+	  (delete-char 1)
+	  (end-of-line)
+	  (insert c)))
+    (forward-line 1)))
+
+(defun zone-shift-right ()
+  (while (not (eobp))
+    (end-of-line)
+    (or (bolp)
+	(let ((c (preceding-char)))
+	  (delete-backward-char 1)
+	  (beginning-of-line)
+	  (insert c)))
+    (forward-line 1)))
+
+(defun zone-pgm-jitter ()
+  (let ((ops [
+              zone-shift-left
+              zone-shift-left
+              zone-shift-left
+              zone-shift-left
+              zone-shift-right
+              zone-shift-down
+              zone-shift-down
+              zone-shift-down
+              zone-shift-down
+              zone-shift-down
+              zone-shift-up
+              ]))
+    (goto-char (point-min))
+    (while (not (input-pending-p))
+      (funcall (elt ops (random (length ops))))
+      (goto-char (point-min))
+      (sit-for 0 10))))
+
+
+;;;; zone-pgm-whack-chars
+
+(defvar zone-wc-tbl
+  (let ((tbl (make-string 128 ?x))
+	(i 0))
+    (while (< i 128)
+      (aset tbl i i)
+      (setq i (1+ i)))
+    tbl))
+
+(defun zone-pgm-whack-chars ()
+  (let ((tbl (copy-sequence zone-wc-tbl)))
+    (while (not (input-pending-p))
+      (let ((i 48))
+	(while (< i 122)
+	  (aset tbl i (+ 48 (random (- 123 48))))
+	  (setq i (1+ i)))
+	(translate-region (point-min) (point-max) tbl)
+	(sit-for 0 2)))))
+
+
+;;;; zone-pgm-dissolve
+
+(defun zone-remove-text ()
+  (let ((working t))
+    (while working
+      (setq working nil)
+      (save-excursion
+	(goto-char (point-min))
+	(while (not (eobp))
+	  (if (looking-at "[^(){}\n\t ]")
+	      (let ((n (random 5)))
+		(if (not (= n 0))
+		    (progn
+		      (setq working t)
+		      (forward-char 1))
+		  (delete-char 1)
+		  (insert " ")))
+	    (forward-char 1))))
+      (sit-for 0 2))))
+
+(defun zone-pgm-dissolve ()
+  (zone-remove-text)
+  (zone-pgm-jitter))
+
+
+;;;; zone-pgm-explode
+
+(defun zone-exploding-remove ()
+  (let ((i 0))
+    (while (< i 20)
+      (save-excursion
+	(goto-char (point-min))
+	(while (not (eobp))
+	  (if (looking-at "[^*\n\t ]")
+	      (let ((n (random 5)))
+		(if (not (= n 0))
+		    (forward-char 1))
+		  (insert " ")))
+	    (forward-char 1)))
+      (setq i (1+ i))
+      (sit-for 0 2)))
+  (zone-pgm-jitter))
+
+(defun zone-pgm-explode ()
+  (zone-exploding-remove)
+  (zone-pgm-jitter))
+
+
+;;;; zone-pgm-putz-with-case
+
+;; Faster than `zone-pgm-putz-with-case', but not as good: all
+;; instances of the same letter have the same case, which produces a
+;; less interesting effect than you might imagine.
+(defun zone-pgm-2nd-putz-with-case ()
+  (let ((tbl (make-string 128 ?x))
+	(i 0))
+    (while (< i 128)
+      (aset tbl i i)
+      (setq i (1+ i)))
+    (while (not (input-pending-p))
+      (setq i ?a)
+      (while (<= i ?z)
+	(aset tbl i
+	      (if (zerop (random 5))
+		  (upcase i)
+		(downcase i)))
+	(setq i (+ i (1+ (random 5)))))
+      (setq i ?A)
+      (while (<= i ?z)
+	(aset tbl i
+	      (if (zerop (random 5))
+		  (downcase i)
+		(upcase i)))
+	(setq i (+ i (1+ (random 5)))))
+      (translate-region (point-min) (point-max) tbl)
+      (sit-for 0 2))))
+
+(defun zone-pgm-putz-with-case ()
+  (goto-char (point-min))
+  (while (not (input-pending-p))
+    (let ((np (+ 2 (random 5)))
+	  (pm (point-max)))
+      (while (< np pm)
+	(goto-char np)
+        (let ((prec (preceding-char))
+              (props (text-properties-at (1- (point)))))
+          (insert (if (zerop (random 2))
+                      (upcase prec)
+                    (downcase prec)))
+          (set-text-properties (1- (point)) (point) props))
+	(backward-char 2)
+	(delete-char 1)
+	(setq np (+ np (1+ (random 5))))))
+    (goto-char (point-min))
+    (sit-for 0 2)))
+
+
+;;;; zone-pgm-rotate
+
+(defun zone-line-specs ()
+  (let (ret)
+    (save-excursion
+      (goto-char (window-start))
+      (while (< (point) (window-end))
+	(when (looking-at "[\t ]*\\([^\n]+\\)")
+	  (setq ret (cons (cons (match-beginning 1) (match-end 1)) ret)))
+	(forward-line 1)))
+    ret))
+
+(defun zone-pgm-rotate (&optional random-style)
+  (let* ((specs (apply
+		 'vector
+                 (let (res)
+                   (mapcar (lambda (ent)
+                             (let* ((beg (car ent))
+                                    (end (cdr ent))
+                                    (amt (if random-style
+                                             (funcall random-style)
+                                           (- (random 7) 3))))
+                               (when (< (- end (abs amt)) beg)
+                                 (setq amt (random (- end beg))))
+                               (unless (= 0 amt)
+                                 (setq res
+                                       (cons
+                                        (vector amt beg (- end (abs amt)))
+                                        res)))))
+                           (zone-line-specs))
+                   res)))
+	 (n (length specs))
+	 amt aamt cut paste txt i ent)
+    (while (not (input-pending-p))
+      (setq i 0)
+      (while (< i n)
+	(setq ent (aref specs i))
+	(setq amt (aref ent 0) aamt (abs amt))
+	(if (> 0 amt)
+	    (setq cut 1 paste 2)
+	  (setq cut 2 paste 1))
+	(goto-char (aref ent cut))
+	(setq txt (buffer-substring (point) (+ (point) aamt)))
+	(delete-char aamt)
+	(goto-char (aref ent paste))
+	(insert txt)
+	(setq i (1+ i)))
+      (sit-for 0.04))))
+
+(defun zone-pgm-rotate-LR-lockstep ()
+  (zone-pgm-rotate (lambda () 1)))
+
+(defun zone-pgm-rotate-RL-lockstep ()
+  (zone-pgm-rotate (lambda () -1)))
+
+(defun zone-pgm-rotate-LR-variable ()
+  (zone-pgm-rotate (lambda () (1+ (random 3)))))
+
+(defun zone-pgm-rotate-RL-variable ()
+  (zone-pgm-rotate (lambda () (1- (- (random 3))))))
+
+
+;;;; zone-pgm-drip
+
+(defun zone-cpos (pos)
+  (buffer-substring pos (1+ pos)))
+
+(defun zone-fret (pos)
+  (let* ((case-fold-search nil)
+         (c-string (zone-cpos pos))
+         (hmm (cond
+               ((string-match "[a-z]" c-string) (upcase c-string))
+               ((string-match "[A-Z]" c-string) (downcase c-string))
+               (t " "))))
+    (do ((i 0 (1+ i))
+         (wait 0.5 (* wait 0.8)))
+        ((= i 20))
+      (goto-char pos)
+      (delete-char 1)
+      (insert (if (= 0 (% i 2)) hmm c-string))
+      (sit-for wait))
+    (delete-char -1) (insert c-string)))
+
+(defun zone-fall-through-ws (c col wend)
+  (let ((fall-p nil)                    ; todo: move outward
+        (wait 0.15)
+        (o (point))                     ; for terminals w/o cursor hiding
+        (p (point)))
+    (while (progn
+             (forward-line 1)
+             (move-to-column col)
+             (looking-at " "))
+      (setq fall-p t)
+      (delete-char 1)
+      (insert (if (< (point) wend) c " "))
+      (save-excursion
+        (goto-char p)
+        (delete-char 1)
+        (insert " ")
+        (goto-char o)
+        (sit-for (setq wait (* wait 0.8))))
+      (setq p (1- (point))))
+    fall-p))
+
+(defun zone-pgm-drip (&optional fret-p pancake-p)
+  (let* ((ww (1- (window-width)))
+         (wh (window-height))
+         (mc 0)                         ; miss count
+         (total (* ww wh))
+         (fall-p nil))
+    (goto-char (point-min))
+    ;; fill out rectangular ws block
+    (while (not (eobp))
+      (end-of-line)
+      (let ((cc (current-column)))
+        (if (< cc ww)
+            (insert (make-string (- ww cc) ? ))
+          (delete-char (- ww cc))))
+      (unless (eobp)
+        (forward-char 1)))
+    ;; what the hell is going on here?
+    (let ((nl (- wh (count-lines (point-min) (point)))))
+      (when (> nl 0)
+        (let ((line (concat (make-string (1- ww) ? ) "\n")))
+          (do ((i 0 (1+ i)))
+              ((= i nl))
+            (insert line)))))
+    ;;
+    (catch 'done			; ugh
+      (while (not (input-pending-p))
+        (goto-char (point-min))
+        (sit-for 0)
+        (let ((wbeg (window-start))
+              (wend (window-end)))
+          (setq mc 0)
+          ;; select non-ws character, but don't miss too much
+          (goto-char (+ wbeg (random (- wend wbeg))))
+          (while (looking-at "[ \n\f]")
+            (if (= total (setq mc (1+ mc)))
+                (throw 'done 'sel)
+              (goto-char (+ wbeg (random (- wend wbeg))))))
+          ;; character animation sequence
+          (let ((p (point)))
+            (when fret-p (zone-fret p))
+            (goto-char p)
+            (setq fall-p (zone-fall-through-ws
+                          (zone-cpos p) (current-column) wend))))
+        ;; assuming current-column has not changed...
+        (when (and pancake-p
+                   fall-p
+                   (< (count-lines (point-min) (point))
+                      wh))
+          (previous-line 1)
+          (forward-char 1)
+          (sit-for 0.137)
+          (delete-char -1)
+          (insert "@")
+          (sit-for 0.137)
+          (delete-char -1)
+          (insert "*")
+          (sit-for 0.137)
+          (delete-char -1)
+          (insert "_"))))))
+
+(defun zone-pgm-drip-fretfully ()
+  (zone-pgm-drip t))
+
+(defun zone-pgm-five-oclock-swan-dive ()
+  (zone-pgm-drip nil t))
+
+(defun zone-pgm-martini-swan-dive ()
+  (zone-pgm-drip t t))
+
+
+;;;; zone-pgm-paragraph-spaz
+
+(defun zone-pgm-paragraph-spaz ()
+  (if (memq (zone-orig major-mode) '(text-mode fundamental-mode))
+      (let ((fill-column fill-column)
+            (fc-min fill-column)
+            (fc-max fill-column)
+            (max-fc (1- (frame-width))))
+        (while (sit-for 0.1)
+          (fill-paragraph 1)
+          (setq fill-column (+ fill-column (- (random 5) 2)))
+          (when (< fill-column fc-min)
+            (setq fc-min fill-column))
+          (when (> fill-column max-fc)
+            (setq fill-column max-fc))
+          (when (> fill-column fc-max)
+            (setq fc-max fill-column))))
+    (message "Zoning... (zone-pgm-rotate)")
+    (zone-pgm-rotate)))
+
+
+;;;; zone-pgm-stress
+
+(defun zone-pgm-stress ()
+  (goto-char (point-min))
+  (let (lines bg m-fg m-bg)
+    (while (< (point) (point-max))
+      (let ((p (point)))
+        (forward-line 1)
+        (setq lines (cons (buffer-substring p (point)) lines))))
+    (sit-for 5)
+    (when window-system
+      (setq bg (frame-parameter (selected-frame) 'background-color)
+            m-fg (face-foreground 'modeline)
+            m-bg (face-background 'modeline))
+      (set-face-foreground 'modeline bg)
+      (set-face-background 'modeline bg))
+    (let ((msg "Zoning... (zone-pgm-stress)"))
+      (while (not (string= msg ""))
+        (message (setq msg (substring msg 1)))
+        (sit-for 0.05)))
+    (while (not (input-pending-p))
+      (when (< 50 (random 100))
+        (goto-char (point-max))
+        (forward-line -1)
+        (let ((kill-whole-line t))
+          (kill-line))
+        (goto-char (point-min))
+        (insert (nth (random (length lines)) lines)))
+      (message (concat (make-string (random (- (frame-width) 5)) ? ) "grrr"))
+      (sit-for 0.1))
+    (when window-system
+      (set-face-foreground 'modeline m-fg)
+      (set-face-background 'modeline m-bg))))
+
+(provide 'zone)
+
+;;; zone.el ends here
+