Vocabulary and Practice

By Frank Ashford

Two Words for Our Lesson:

Optical, and Illusion.

Optical

Which One Is Optical?

A B

C D

Optical = About Sight

• Eyeglasses

• Camera

• Telescope

• Microscope

• Illusion

Illusion?

Which Is an Illusion?

A B

C D

They Are All Illusions!

A B

C D

Nature Fractal

SpaceMan-made

In a way…

Illusion = a False Picture

• Nature

• Man made

• Fractal

• Space

• Optical illusion

Optical Illusions!

Here Is the Crazy Fork:

Let’s draw one ourselves!

1) Draw six parallel lines.

2) Draw ovals connecting every other pair.

3) Draw these little lines to make the ends into tubes.

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.

You Have the Crazy Fork:

Give yourself a hand!

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