Algodoo

No, they are not the same %-)

Good illusion even if no changes, but here are some thoughts (spoiler alert):

1. If you clone the image, then there is no question that they are the same size. Right now they are a little different.

2. If you change the right image to 50% opacity before moving, and make sure its on top, then the overlay will appear to snap into focus.

3. If someone answers "yes" to your question, they are guaranteed to always be correct.

4. You probably wouldn't even ask the question if you didn't think they were the same size.

5. Maybe you can make the image movement bidirectional.

6. The only reason I'm picking on this scene is because I don't have the brainpower to come up with my own unique scene.

K and S ---- Yes, I realize they are not "perfectly" the same size. Part of the problem was because I'm not very skilled at cutting out textures, and the other problem was, I needed to get the exact height to width ratio of the box. It had to match the original dimensions of the background of the picture. If it was not exactly the same, then the mona lisa image would not have the exact same dimensions as the original.

S -- Thanks for all your suggestions! They are very good, and I appreciate them, but I'm not going to bother making any changes. The scene is "good enough" as it stands, and if not too picky about being "perfect", it does demonstrate very well how your brain can be fooled by perspective. Be my guest if you would like to improve it!

Thanks again, guys.

Nice scene! It a good illusion.

They Are The Same Size. I Know About Optical Illusions.

they are the same size