;;; Reactive positions
-(define (waggle) (cos (* pi (current-time))))
-(define (wiggle) (sin (* pi (current-time))))
-
+(define (tick) (* 3000000 (get-internal-real-time)))
+(define (waggle) (* 200 (+ 1 (cos (* pi (tick))))))
+(define (wiggle) (* 300 (+ 1 (sin (* pi (tick))))))
;;; First example