E, the circle withthe tangents looks larger than the other circle. The fartherdistance between the tangent lines and the second circle,creates the illusion that the second circle is smaller. In Thefigure-and-ground illusion, figure F, you might see a white vaseagainst a black background. You might also see two blacksilhouettes against a white background. This illusion showsobject reversibility as well as the Necker Cube. In the Zollnerillusion, figure L, the short lines intersecting the vertical linescreate the illusion that the long vertical lines are not parallel.It has been said that some optical illusions, such as the“flip-flop” of the Necker Cube, are easier for younger people tosee, and more difficult for mature people to see. None theless, whether you’re young or old, optical illusions arefascinating. ...
