Puzzle question (Which is true statement)

After you've answered the poll download the image and cut and paste the squares

¡Que interesante! I just poked a hole in a piece of paper to compare. This seems more of an optical illusion than a puzzle to me.

Here's a LIVE example of this puzzle.

Even better, open a raster editor, copy an area of the "A" brick, and then drag it left/right over the green cylinder. It seems to change shades before your eyes.

Quote: MathExtremist

Even better, open a raster editor, copy an area of the "A" brick, and then drag it left/right over the green cylinder. It seems to change shades before your eyes.

Copy the A brick and drag it up and down the shaded portion of the green cylinder.

I wonder how unreal the illusion actually is. It seems to me that you could take a true black and white pattern, and set both your ambient light and your directional light so that the square B ends up being shaded so that it is the exact grayscale as A.

I say this could not be duplicated to this degree "in real life", in other words it takes a special camera. I'm not saying the effect is otherwise faked, just that it requires that camera.

The Checker Shadow Illusion is something I find fascinating. I am of the opinion that since square A "appears" darker than square B, that it is not incorrect to state that square A is darker than square B. Yes, we can see that the shades of gray are the same, by various methods, but I feel that, in the image as it is presented, the darker looking square is indeed darker.

If you go to a paint store, they have a display that will show you what various shades of paint color will look like under differing kinds of light. I believe the idea is that you want to see what your paint would look like with the kind of lighting you have in your home. However, according to the optical illusion, the shades of paint are all the SAME color, they just APPEAR differently under different lighting. Thus, if you wanted Rust Red, but when it was applied to your walls it appears to be more Orange Red, you would simply state to your guests that it really IS Rust Red, but due to the optical illusion caused by the lighting, it looks to be a different shade. Or, you could just get the color of paint that will apply to your wall and give you the shade you want under the lighting that you have.

Thus, in the optical illusion, even though we can cut out the two squares and put them side-by-side under identical lighting and thus prove they are the same shade, the fact remains that under differing lighting, the two shades are NOT the same. Thus, I argue that it's ok to consider square A to be darker.

konceptum -

That's a very round-about way of saying that the green cylinder is a solid color - which is assumed.