Permissions

Home page graphics:

vase, book, www.eyesearch.com, e-mail permission
old lady, beakman.com, e-mail permission
arrows, circles, liar, triangle, saxplayer, rabbuck, stairs,
members.aol.com/Ryanbut/optical.htm, e-mail permission

eye gif, by Kevin Sullivan, www.kevdebin.altnet.com, site permission
email icon, schoolicons.com, site permission

How we see page:

eye, www.nei.nih.gov/photo/eyean/images/eye_lg.gif, e-mail
permission

Perception page:

Unless otherwise noted, all graphics for this page were taken from "Now You See It, Now You Don’t" by Seymour Simon on the following pages:

(lines)
trio of lines, pages 18 and 19
circle/squares, pages 21, 22. 23 and 24
(depth)
A/B perception, page 37
balls, page 39
(brightness)
contrast, page 43
(changeable)
spiral lines, page 30
dog, page 31
(shadow)
Herman’s grid, page 44
*(3D)
Necker’s cube, encyclozine.com, email permission
*(facial)
old lady, members.aol.com/Ryanbut/optical.htm, email permission
presidential, encyclozine.com, email permission

Types page:

(impossible)
stamp, mad magazine cover, sandlot.com, email permission
(3d)
necker's cube, run-down.com, email permission
(camouflage)
jewel beetle, photo by Jeong-Hwan Kim as on animalpicturesarchive.com
(facial)
old lady (see home page)
President Clinton, encyclozine.com, email permission
(afterimages)
color elephant, "Optical Illusions" by Laurence White Jr. & Ray Brokekel, pg. 64
(ambiguous)
german postcard, sandlot.com, email permission
(distortion)
arrows (see home page)
(color and shadow)
Herman's grid, run-down.com, email permission

Uses Page:

Unless otherwise noted, all graphics for the art section were taken from "Optical Illusions in Art" by Alexander Sturgis on the following pages:

(realism)
"Still Life with Flower Garland," pg. 4
Portrait with Fly, pg. 5
(perspective)
"False Perspective," pg. 15
(surrealism)
"Empire of Lights," pg. 27
(Escher)
portrait and "Ascending and Descending," All M.C. Escher works (c) 2001 Cordon Art - Baarn - Holland. All rights reserved. Used by permission
(OpArt)
"Square of Three," pg. 30

(artists)
(Albers)
"Homage to a Square, "Modern America-OpArt, and the School of Color," by Sam Hunter, pg. 58
(Vassarelly)
"Tridem K," see above, pg. 56
"Cheyt M," see above, pg. 55
(Dali)
picture, "Biography" magazine, January 2001 issue, pg. 106
"Persistence of Memory," "Dali's Optical Illusions" by Dawn Ades, pg. 39
(tessellations)
All Escher works, All M.C. Escher works (c) 2001 Cordon Art - Baarn - Holland. All rights reserved. Used by permission
(technology)
TV, "Optical Illusions: ZigZag Factfinder" by Duncan Muir, pg. 15
Man falling off building, above book, pg. 21
sleight of hand, above book, pg. 22
(jobs)
flight simulator, above book, pg. 26
fashion designer, above book, pg. 26
garden, above book, pg. 27
(nature)
common comma butterfly, photo by Darin Ungerman, permission pending
walking stick, photo courtesy of M. Kramer

Gallery Page:

(opening)
circle, encyclozine.com, email permission
(impossible)
triangle, "Now You See It, Now You Don't" by Seymour Simon, pg. 17
window, same book as above, pg. 32b
stairs, encyclozine.com, email permission
impossible cube, encyclopzine.com, email permission
Schroeder's staircase, ads-online.on.ca, email permission
impossible blocks, ads-online.on.ca, email permission
(ed)
cross and roses, eyetricks.com, email permission
(afterimages)
queen Elizabeth, ads-online.on.ca, email permission
gray circles, illusionworks.com, email permission
(distortion)
all graphics on this page from encyclozine.com, email permission
(ambigous)
elephant, "Little Book of Optical Illusions" by Keith Kay, pg. 85
liar, eyetricks.com, email permission
rabbuck (see home page)
duck, encyclozine.com, email permission
(facial)
eskimo, run-down.com, email permission
cowboy, run-down.com, email permission
man/girl, "Little Book of Optical Illusions" by Keith Kay, pg. 102
(camouflage)
all graphics from this section taken from sandlot.com, email permission
(color)
green/pink, "Now You See it, Now You Don't" by Semour Simon, pg. 32a
two shades of green, eyetricks.com, email permission

Activities page:

(experiments)
hole in the hand, doscience.com, email permission
(favorites)
two faces, run-down.com, email permission
spiral circles, eyetricks.com, email permission
triangle with words, eyetricks.com, email permission
impossible fork, run-down.com, email permission