(define randcircles
  (lambda (n rmax lmax)
    (let
      ((x (random lmax)) (y (random lmax))
       (fill (random 2))
       (radius (+ (/ rmax 2) (random (/ rmax 2)))))
      (draw-color 
        (random 256)
        (random 256)
        (random 256))
      (draw-move x y)
      ((if (zero? fill) draw-circle fill-circle) radius)
      (if (not (zero? n))
        (randcircles (- n 1) rmax lmax)))))
        
(randcircles 25 30 250)