Article from the Guardian ( ) this morning - the Coffer illusion. The picture below contains rectangles & circles.
There's deffo circles in there... I'm gonna leave it a few hours before telling all & in the meantime there's a prize of a toffee crisp for the first person who spots them.
Correct Sir! and as you are the first you may claim the Toffee Crisp first prize... which comes with a £5.30 delivery charge. Oh.. I must have forgot to mention that... ha!