English: A gif animation produced on MSWlogo version 6.5. It illustrates a square fading from black to white. The code follows:

to squareani :number
 setactivearea [-5 -5 105 105]         ;we do not want to save the entire screen
 local "col
 setpensize [3 3]                      ;make it a noticeable square
 make "append "false                   ;signify that we want to start a new animation
  repeat :number [
   cs
   make "col 255*(repcount-1)/(:number-1)
   setpc (list :col :col :col)         ;change the square's color
    repeat 4 [                         ;
    fd 100 rt 90                       ;draw the square
    ]                                  ;
  (gifsave "squareani.gif 5 :append 0) ;save to squareani.gif
  make "append "true                   ;from now on, we want to keep adding frames to squareani.gif
  ]
end

(with :number as 15)