2. Vocabulary and Practice By Frank Ashford

3. Two Words for Our Lesson: Optical, and Illusion.

4. Optical

5. Which One Is Optical? AB C D

6. Optical = About Sight Eyeglasses Camera Telescope Microscope Illusion

7. Illusion?

8. Which Is an Illusion? A B CD

9. They Are All Illusions! A B CD NatureFractal SpaceMan-made In a way…

10. Illusion = a False Picture Nature Man made Fractal Space Optical illusion

11. Optical Illusions!

12. Here Is the Crazy Fork: Let’s draw one ourselves!

13. 1) Draw six parallel lines. 2) Draw ovals connecting every other pair. 3) Draw these little lines to make the ends into tubes.

14. 4) Draw the back. 5) Draw a line from the bottom of the middle tube to the bottom of of the top tube. 6) Draw a line from the top of the bottom tube to the back of the fork.

15. You Have the Crazy Fork: Give yourself a hand!

16. Vocabulary and Practice By Frank Ashford Kitaoka, A (2002). Akiyoshi's Illusion Pages. November 13, 2007, from Akiyoshi's Illusion Pages Web site: http://www.ritsumei.ac.jp/~akitaoka/index-e.html The Official M.C.Escher Website. Retrieved November 13, 2007, from The Official M.C.Escher Website Web site: http://www.mcescher.com/Gallery/gallery.htm Tech4Learning, (2007). Pics4Learning. Retrieved November 13, 2007, from Pics4Learning - Tech4Learning Web site: http://pics.tech4learning.com/ Bach, M (1997, April 13). Optical Illusions and Visual Phenomena. Retrieved November 13, 2007, from 75 Optical Illusions & Visual Phenomena Web site: http://www.michaelbach.de/ot/index.html Wikipedia, (2007, November 13). Optical Illusion - Wikipedia. Retrieved November 13, 2007, from Optical Illusion Web site: http://en.wikipedia.org/wiki/Optical_illusion