There is a whole genre of art elements that are desinged to play tricks on the brain and visual perception. Here is a sample of some of the best and well known art examples.
How many ships can you see?
Ever wanted to rock out on your rooftop? Would you see faces in the crowd or just houses?
Horses in the rocky mountains. Look closely and you should be able to see 7.
A couple of old faces or a mexican fiesta?
Reality and Picture Puzzle blurred.
How many creepy people can you see cloaked out in white garb?
Small deer or big deer? How many deer can you identify? look closer…
Back in rome things weren’t what they always seemed. Look at the middle column, where does it end?
People in people. Whoa. Can you see all four people in this picture?
Who is the tallest of these miltary looking dudes? Aren’t they all the same size?
The famous Liar Face! Is is a face of a man or the word Liar? Or both…
What do you see here? Can you find the word lift? or just a bunch of black splotches…
Mountain faces. There are 11 human faces in the picture. The average person can spot about 5.
This classic is called the Baby womb. Can you see the baby?
Most from unknown sources with reference to www.indianchild.com and www.extremus.net.