Okay, on Firefox, I had this weird idea to just draw a cat, then trace over it (using onion skin mode) and then tracing over that tracing, 20 times. Now, I've downloaded all the pictures onto scratch so you can watch how they transform and vary each time. click the play button to play, click the pause button twice to pause, or click it once to make it so the animation only goes to the end. then click the line button to play on repeat. If you have the button on play only until finished (-) then when you get to the end, there'll be a replay button for you to click, then it'll start again to change speed, simply slide the slider. or instead, you could leave it on pause, and use the arrow keys to navigate through the slides.