This incredible photo and art piece by German artist Jorg Dusterwald is a real test of vision. If you can find the image without the hint, you are considered to have an above average IQ.
This artist travels around, taking photos and painting women to create his masterpieces. Body painting is a truly beautiful form of art, and the hidden game factor is an added bonus.
(Spoiler) In this particular photo, he disguises a woman by painting her the color of leaves and bark.