
An image of a stone in a wall captured an awful lot of attention this week, so, to keep in the mood, here are 10 optical illusions to confuse your brain.
Colours and lines are things most of us feel we can manage when processing images. We can tell what’s in black and white, what’s got too much colour, we can spot straight lines, loops, circles and bends.
But can we? There are plenty of examples that prove our mind can be easily tricked. Here are 10 optical illusions. Enjoy:

Are these horizontal lines parallel or not?

Can you see a spiral? If so, put a pen on to one of the boxes and follow it around from start to finish…

Where is the panda?

Yes, or no?

Stare at the cross in the centre of the screen and watch as celebrity faces change… via Reddit
Okay, the above is going to wreck your head, so here is an explanation:
There’s always room for some perspective (via Imgur)
What do you see below?
Oh, here is the stone in the wall that started all of this off. It looks like a stone in a crevice of a wall. But do you see it yet?
Main umbrella image via Shutterstock