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ColinJ replied to the thread Can't believe my eyes! (Optical illusion.).

Ha ha ha - that's brilliant!

ColinJ liked presta's post in the thread Can't believe my eyes! (Optical illusion.).

[MEDIA] View: https://www.youtube.com/watch?v=DkVOIJAaWO0

ColinJ replied to the thread Can't believe my eyes! (Optical illusion.).

Interesting - 'A' looks a very dark grey to me and 'B' a light grey in shadow, but still much lighter than 'A'!

ColinJ replied to the thread Can't believe my eyes! (Optical illusion.).

Are you saying that the 2 squares both look the same shade of grey to you then?

ColinJ replied to the thread Looking to start doing a few more hills.

If you have low enough gears and pace yourself then possibly! If you try sprinting up in too high a gear then you will discover an important fact about yourself ... :whistle: :laugh:

ColinJ replied to the thread Can't believe my eyes! (Optical illusion.).

I have a game called 'Color Puzzle' on my phone which is based on lining up squares of various shades. I've noticed that the squares seem to change colour as they are moved about relative to each other.

ColinJ replied to the thread Can't believe my eyes! (Optical illusion.).

I think that every time I see the current president of the USA! :laugh: (And I will do a double-take when Boris becomes the next PM too ...)

ColinJ liked MontyVeda's post in the thread Can't believe my eyes! (Optical illusion.).

How can i trust my eyes after this?

ColinJ attached a file to the thread Can't believe my eyes! (Optical illusion.).

I've just masked out a lot of the picture and suddenly the squares look the same shade! [ATTACH] Thanks - that looks an interesting site!

ColinJ liked Seevio's post in the thread Can't believe my eyes! (Optical illusion.).

It really doesn't. Mask out the background so you can only see the bar. (your thumbs will do if you are viewing on a phone)

ColinJ liked Rezillo's post in the thread Can't believe my eyes! (Optical illusion.).

https://www.illusionsindex.org/ir/checkershadow or to quote the easier bit of it: "While there is a shadow depicted as falling across the checkerboard, there isn't really a shadow there—for Adelson's Checker-Shadow illusion is just a picture of...

ColinJ liked Beebo's post in the thread Can't believe my eyes! (Optical illusion.).

Isn’t the brain a clever thing. It knows that the lighter square in the shade should be lighter, so convinces us that what we see is actually wrong.

ColinJ replied to the thread Can't believe my eyes! (Optical illusion.).

That's the point - it LOOKS as if it does, but that is the same bar as in the first picture. It is one solid shade of grey with no changes in it. All I did was pick it up and drag it over! The bar and the squares all have RGB values of #787878.

ColinJ posted a new thread.

Can't believe my eyes! (Optical illusion.)

I just found something online which I found unbelievable, so I did what was suggested and imported the picture into a drawing package and checked... the statement is correct! Take a look at it ... [ATTACH] I added the bar labelled 'C' to check...

Forum: CycleChat Cafe

ColinJ liked Sea of vapours's post in the thread Ribble valley/Yorkshire Dales ride, Sat 22nd June, 2019.

Mmmm...... yep, your edited version is most definitely considerably superior!