1. This picture can be seen as both a duck and a bunny, depending on the angle viewed. This is a simple perspective illusion known as an ambiguous image.
2. There seems to be triangle, when in reality the are only partial lines and circles.
3. This illusion is created using a background of lines sloping up and a foreground of lines sloping downward. The alternating 45/135 degree angles give the illusion of movement.
4. This motion illusion is due to the alternating colors in a bowed shape, and can be quite nauseating.
5. This illusion is made because the brain inhibits the color at the corners where the light intensity is higher. This in inhibition creates phantom grey dots at each intersection, unless you focus on a specific corner.
6. This illusion is caused because the circle in the center is blurry and seems to be out of focus relative to the background. Therefore, the brain tries to focus on it, even though it is technically already in focus. This registers in the brain as a tremor of the circle.
2. There seems to be triangle, when in reality the are only partial lines and circles.
3. This illusion is created using a background of lines sloping up and a foreground of lines sloping downward. The alternating 45/135 degree angles give the illusion of movement.
4. This motion illusion is due to the alternating colors in a bowed shape, and can be quite nauseating.
5. This illusion is made because the brain inhibits the color at the corners where the light intensity is higher. This in inhibition creates phantom grey dots at each intersection, unless you focus on a specific corner.
6. This illusion is caused because the circle in the center is blurry and seems to be out of focus relative to the background. Therefore, the brain tries to focus on it, even though it is technically already in focus. This registers in the brain as a tremor of the circle.
http://www.sciencebob.com/graphics/3512883.jpg
http://ssheltonimages.com/img/22/22f/A_collection_of_over_65_optical_illusions.jpg
http://sciencebasedlife.files.wordpress.com/2011/10/not-a-gif.jpg
http://www.rickroot.com/blog/1/custom/images/2007/05/optical_illusion_3.jpg
2.bp.blogspot.com/_0etVJGROo60/SJsOqW5jKVI/AAAAAAAAA6w/b-BViLM0YZ8/s320/eye+tricks+triange+illusion.JPG
http://4.bp.blogspot.com/-l5eHwQE1U8k/Tq0HL9BtVjI/AAAAAAAACRM/t4pnHuW85bg/s400/I%2Bcan%2527t%2Bsleep%2Boptical%2Billusion.jpg