Exploratorium
Exploratorium: Mona
At this site see the effects our brains have on what we see when we view a picture upside-down.
Exploratorium
Exploratorium: Desvanecimiento Del Punto
An optical illusion that demonstrates the effect of eye movement on perception.
Science Bob Pflugfelder
Science Bob: See Some Optical Illusions
A webpage on optical illusions, containing a grid of black squares, an elephant with four or five legs, and a picture with three faces in it.
CK-12 Foundation
Ck 12: Plix: Optical Illusion: Vision and the Eye
[Free Registration/Login Required] Interactive explores the concept of optical illusion.
Hunkins Experiments
Hunkin's Experiments
Hunkin's Experiments is a group of simple cartoon illustrations of scientific principles. Some would work well in the classroom, but others have little value beyond entertaining students. All of the projects are easy to do and use...
![Sandlotscience.com: Plans for Missing Corner 3 D Cube [Pdf] Activity](http://content.lessonplanet.com/resources/thumbnails/411248/large/bwluav9tywdpy2symdiwmduymc01njg0lwltaxmzzy5qcgc.jpg?1589993095 "Sandlotscience.com: Plans for Missing Corner 3 D Cube [Pdf] Activity")
Other
Sandlotscience.com: Plans for Missing Corner 3 D Cube [Pdf]
A set of plans from Sandlotscience.com for building a cubic optical illusion in 3-D. Useful for demonstrations and projects.
![Color Reversing Flag [Pdf] Activity](http://content.lessonplanet.com/resources/thumbnails/411250/large/bwluav9tywdpy2symdiwmduymc01njk3ltvrbwdycc5qcgc.jpg?1589993095 "Color Reversing Flag [Pdf] Activity")
Other
Color Reversing Flag [Pdf]
Use this picture to create a color reversing illusion. Great for projects and presentations.
![Sandlot Science: The Ambiguous Cube Illusion [Pdf] Activity](http://content.lessonplanet.com/resources/thumbnails/411251/large/bwluav9tywdpy2symdiwmduymc02mdkylte3n2libi5qcgc.jpg?1589993104 "Sandlot Science: The Ambiguous Cube Illusion [Pdf] Activity")
Other
Sandlot Science: The Ambiguous Cube Illusion [Pdf]
Plans for building a 3-D cube illusion. Useful for projects on perception and vision.
![Sandlot Science: The Impossible Triangle [Pdf] Activity](http://content.lessonplanet.com/resources/thumbnails/411256/large/bwluav9tywdpy2symdiwmduymc04otiwltflnzhom3uuanbn.jpg?1589993168 "Sandlot Science: The Impossible Triangle [Pdf] Activity")
Other
Sandlot Science: The Impossible Triangle [Pdf]
Plans for building a 3-D triangle with seemingly impossible structure. Good for projects and presentations.
Exploratorium
Exploratorium: Exposicion De Tarjetas Postales
Four postcard-sized optical illusions that can be used to demonstrate how patterns and color influence perception.
Exploratorium
Exploratorium: La Ilusion Del Brillo
An optical illusion that demonstrates the effect of eye movement on perception.