Can you spot an old woman or a young girl hidden in this Century Old Optical Illusion? The challenge is to spot what’s hiding in the image in between the zig-zag lines, which will tell if you ...

There is a (pun intended) kink in this method of processing visual information however, which arises in the form of an illusion in the ... cusp of smooth versus zig-zag, we’ll err on the side ...