These are the best and most unusual that I have seen.
DO YOU SEE FOUR PEOPLE?
Who is the tallest?
This is a so called "impossible object". This means that it's impossible to build it! But drawing it is not impossible, as you see in the image.
How many horses in this picture?
The Answer is 7.
A face? . Or, the word 'liar' ?
Look at the middle column.
Where does it end?
GIRLS ARE ABLE TO SPOT THE WORD "LIFT" EASILY.
MEN FIND IT DIFFICULT TO SEE THE WORD "LIFT"!!!