Lesson 3

Explore

Dmytro Bezsmertnyy, www.hidden-3d.com

A stereogram is an image on a flat surface that renders an illusion of three dimensions. The 3-D image hidden within a stereogram typically cannot be seen with a casual glance. In order to view the image, you must apply any of several methods that “trick” your eyes into seeing the image or, more likely, allow your eyes to focus properly. For example, people have had success by focusing beyond the image, or even crossing their eyes. By disregarding the extraneous and focusing one’s attention on the middle of the image, you will be able to see what was previously unseen. Print Stereogram, and then try the suggested techniques to see if you can spot the two creatures hiding in the “grass.”

In this lesson you will learn to identify extraneous solutions when solving absolute value equations, much like you would ignore the extraneous details when working with stereograms.