Are you able to spot the women's faces in these optical illusions by artist Lee Wagstaff? Lee Wagstaff uses mesmerising patterns to immerse images in his art - and sometimes they're near impossible to spot. Each of the artworks almost appear as though they're moving, due to the fluid linework and soft angles. According to research conducted by Current Biology, people with a higher IQ have an easier time identifying shapes and details within an optical illusion. How many can you solve?