Dear Scott! Now this is an illusion! Hmm… I wasn’t trying to impersonate Doc. Emmet Brown from Back to The Future, just wanted to literally thank Scott for sending me this awesome animation below. When I first saw it, I almost tossed it down the trash can, but in the last moment I noticed what is so special about it. Just like the spinning lady was spinning in both directions, same thing goes for this cargo train. First I saw it travel towards the left, but when I (by accident) noticed it’s wheels, I started seeing it move towards right. Great fun starts when you try to switch it’s direction each second. Can you also do it, or is it only me being a pro by now? If you ask yourself why did I add another train image in the upper right corner, well its because of the Mac Widget. Apparently, when the animations are shown in the widget it uses much of your CPU power, so I set it to show the first (static) image instead. Do you see how I look after you? Hope its appreciated :) And this is Scott’s original email: “Hello, I saw this animation posted to a picture community I’m part of, and it reminded me of the “which way is it turning?” illusions you’ve posted. At first I saw it moving to the left, then going to the right, and it took some work to get it going left again. Here you go. Thanks for the site!”