Is  the left centre circle bigger?

→No.They're both the same size.

Keep staring at the black dot.

after a while,the grey haze around it will appear to shrink.

Stare at the black lightbulb for 30 seconds.

Then immediately stare at a white area at a sheet of paper .

You will see a glowing lightbulb.

How many colours can you see?

There are only 3 colours: White,Green,Pink.

There seem to be two different shades of pink,but there is only one pink.

Can you see a couple or a skull?

Is it moving or shimmering?

Stare at the grey dot in the middle.

Move your head forward and backward.

Can you see the circles spinning?

Are the purple lines straight or do they bend?

Very strange?!/

Stare at the centre of the flag for about 1 minute.

Don't move your eyes.

Then look at an empty white sheet and you will see a red,white,blue flag.

 Is it a duck or a bunny?

Say the colour of the word,not the word itself.

Is it difficult ?

It is because your right half brain is trying to say the colour,

while the left half brain is trying to say the word.

haha.so funny.isn't it.

Try more at the following website.

http://www.optillusions.com/

Buh-bye!**