This grid and the text quoted below are from Grand Illusions
"Just count the little black balls...
There are different names for this illusion, but the Scintillation Grid is probably the proper name. This illusion was found by Elke Lingelbach of the Institut fur Augenoptik Aalen in Germany, and is a modification of an illusion called the Hermann Grid, which dates from 1870!"
I apologise now if you emerge cross-eyed as I have from staring at this grid!
But isn't this amazing?!?! I thought so.
And this is for the lovely fairyhedgehog. She advertised a competition run by Disgruntled Bear. All I had to do was comment on Disgruntled Bear's blog and I was given a lovely t-shirt promoting her self-published book "Minder" on the condition that I wear it somewhere crazy.
This was't the pic I sent - it was a trial run!
Charlie says: OI! Gerroff my segment of your blog!
Have a "phew wot a scorcher!" Monday everyone.