The problem with arguing about shades of grey.

[Dave A]

How good is your eyesight?

Which is a darker shade of grey, block A or block B?

[Neville Bailey]

There is only one shade of grey - block A.

The green cylinder is casting a shadow over the white block B, making it appear to be a light grey.

[IanF]

I used tell my customers printing relies on optical illusion, but I always got a quizzical look back. If you have a 8x magnifying glass look at a pictures of a person from a magazine through it. You should see little dots, because the eye can't magnify to any great extent we can use just the 4 process colours to print in full colour.

[Dave A]

There is only one shade of grey - block A.

So are you saying block B isn't a shade of grey?

[Neville Bailey]

So are you saying block B isn't a shade of grey?

Let's not start arguing now!

No, block B is white - it just appears to be grey coz it's in the shadow of the green cylinder.

It's a trick question, I tell you!

[Dave A]

It's a trick question, I tell you!

Oh it is a trick question

Would you believe me if I told you that Block A and Block B are both the same colour?

[daveob]

I would say that "A" and "B" are the same colour ( the letters themselves ) but the blocks they are located on, are not the same.

[tec0]

Excluding the black frames in my picture and the green on the picture the “greys” are shown beneath thus concluding that they are all a variation of grey. However quantum physicists now belief that matter cannot exist without mind entering into it. So it boils down to a point of view and mind set.

[AndyD]

Oh it is a trick question

Would you believe me if I told you that Block A and Block B are both the same colour?

Yes I would......they're both gray.

[daveob]

OK. Have just put this in photoshop, colour sampled the A block, and painted a wide line from A to B. Guess what ....

[tec0]

Before we conclude that I am stupid, let me note that if you zoom in enough you will find a cluster of grey colours, so sampling the colour is “random” to a degree. You will find that in my picture with 5 blocks that yes A and B is the same colour.

However if you look at the picture with 4 blocks you will find that yes they are not the same. It is difficult to tell but the blue block is B and the green block A so there it is. Sample it yourself under magnification.

[Dave A]

Amazing, isn't it.

Yep - software that color samples and give you the hex tells you they're the same color, but the eyes just don't believe it. I know seeing is believing and this is about as close to "seeing it" as I can get it

[IanF]

The power of anchoring is amazing!

[IanF]

The other way to check is print it out and cut out the squares then compare.
How many legs does this elephant have?

[daveob]

and if you stare at this car long enough, you'll eventually see a girl ....