Adjust Your Glasses

[Bazile]

Time for a visit to that castle ?

https://ibb.co/B3h90H2

[Patsy33]

Cool!

[Tilly2]

Eh?

[bhg481]

Optical illusion, Tilly. If you cover the bright horizontal strip the two cushions can be seen to be the same colour/shade.

[ladybirder]

Not for me they don't.

[ubasses]

nor me

[Smowball]

Ooh clever!

[Tilly2]

The top one's still marginally darker but I get the drift. :-)

[AuntPollyGrey]

Nor me -I'm on a laptop maybe it works better on a phone?

[cashier]

Still quite different for me.

[Sam1960]

Try using the spine of a book, or something similar, instead of using your finger.

Quite clever.

[237SJ]

It works if you have fat fingers that can block out a sizeable portion of the area between the two sections.

[Mamyalynne]

A simpler example and the explanation here.

https://en.wikipedia.org/wiki/Cornsweet_illusion

[malagabob]

Seen this one. https://www.google.co.uk/url?sa=t&rct=j&q=&esrc=s&source=web&cd=&ved=2ahUKEwjthumixd7uAhWPxIUKHdxkBJsQFjAKegQIBhAC&url=https%3A%2F%2Fwww.dailymail.co.uk%2Ffemail%2Farticle-9227243%2FBaffling-optical-illusion-divides-internet-dog-man-forest.html&usg=AOvVaw3pKDvznaHegC7te4qXNoFA

[nescio]

Also, look at the chequer shadow illusion - even more astounding

[DTCwordfan]

remember this one, drawn by the Dutch artist, Escher - https://upload.wikimedia.org/wikipedia/en/b/ba/DrawingHands.jpg

[aelmpvw]

all i can see is an excellent drawing of two hands?

[bhg481]

ael - yes, but each one is on top of the other.