Curated OER
Science Kids: Science Images: Parallel Lines Cafe Wall Illusion
This famous optical illusion makes the parallel horizontal lines appear to be bent when in fact they are straight. It was originally noticed amongst the tiles of a cafe wall and can now be seen in architecture such as on a large building...
Curated OER
Science Kids: Science Images: Saxophone Illusion
Does this optical illusion show a man playing a saxophone or a woman's face? You be the judge.
Exploratorium
Exploratorium: Exposicion De Tarjetas Postales
Four postcard-sized optical illusions that can be used to demonstrate how patterns and color influence perception.
![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.
Curated OER
Science Kids: Science Images: Afterimage
The following picture is an example of an afterimage, a type of optical illusion that continues to appear in one's vision even after you finish looking at the original image.
Curated OER
Science Kids: Science Images: Bezold Effect
The Bezold effect is named after Wilhelm von Bezold, a German professor of meteorology. It is an optical illusion that makes colors look different depending on their relation to adjacent colors. It works with small sections of color...
Exploratorium
Exploratorium: Science Snacks: Looking a Little Spotty
By using digitally manipulated images, test your brain to see how much information is needed for your brain to produce an image.
George Eastman Museum
George Eastman House: Create a Thaumatrope
Simple but amazing! Learn how to make a thaumatrope, one of the earliest forms of cinematography. Watch as two images become one right before your eyes.
PBS
Pbs Teachers: Growing Up Different: Familiar Faces
Explore the handicap of autism and the inability to recognize faces. Create a mixed-up face with the mouth and eyes flipped upside down and conduct a survey of how five people are able to describe the expression on the face.
![Sandlotscience.com: Color Reversing Landscape [Pdf] Activity](http://content.lessonplanet.com/resources/thumbnails/411249/large/bwluav9tywdpy2symdiwmduymc01njk0ltdscnbobc5qcgc.jpg?1589993095 "Sandlotscience.com: Color Reversing Landscape [Pdf] Activity")
Other
Sandlotscience.com: Color Reversing Landscape [Pdf]
Print and color this image from Sandlotscience.com to create a color-reversed illusion.
Other
Sidewalk Chalk Guy
This unknown chalk pastel artist creates unbelievable 3-dimensional images on the sidewalks of the city.
BBC
Bbc: Bitesize: Gcse: Physics: Reflection and Refraction
All waves will reflect and refract in the right circumstances. The reflection and refraction of light explain how people see images, color and even optical illusions. This tutorial discusses each concept and presents an experiment to try...
Curated OER
Portraits of Charles Ii and His Daughter Christine of Lorraine
An image of "Optical Illusion with Portraits of Charles II and His Daughter Christine of Lorraine", created by Lodovico Buti in 1593 (Oil on prismatic panels, glass, 82 x 112 cm).