Announcement: I now have a flickr account for my origami photos! Now the images are bigger, and you can find them all in one place. There are also lots of photos that I haven’t (yet) posted on my blogs.
Over a year ago, I designed an origami arrow that points in the opposite direction when looked at in a mirror. I wanted to revisit the design, and make it easier to fold, because this is basically the most popular origami thing I have ever done. Below, I show detailed diagrams, and a sneak peek behind the curtain.
This model was based on a paper by Kokichi Sugihara, explaining a particular optical illusion. You can watch an amazing video showing a cylinder that has a square reflection. My model is optimized for viewing at a 45 degree angle, and it works best at a distance (because of field of view effects).
You are free to print out these instructions. But if you plan on distributing copies, please ask permission. E-mail me at skepticsplay at gmail dot com, so I can give you a proper pdf.
What does the illusion look like from a different angle? The illusion breaks down fairly quickly, as you can see here: