Optical illusions have been popular for hundreds of years and are a source of fascination for many. These illusions can take many forms, from making you see things that aren't really there, to seeing multiple things in a single image. They have been developed and used by psychologists and used by artists as far back as the 18th century. In this activity, students will have the opportunity to explore four optical illusions in a way that is very different than how they are normally presented. The four illusions used here are all variations on the same theme: length distortion. To ensure a better quality print job, this month's puzzle is being provided as a PDF file. To view this file you will need version 5 or later of the free Adobe Acrobat Reader. If you do not have this free software, it can be downloaded from http://www.adobe.com/
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