What Do You See?

Welcome to the world of optical illusions (:

Have you ever caught your eyes playing tricks on you? You can blame that on your brain. Optical illusions are caused by your brain making assumptions on what it doesn't completely comprehend.

Pictures can be perceived differently by each individual depending on the way that certain individual's brain sees it. For example in the picture below:

Another way optical illusions work is by after images. After images are caused by the cones in your eyes over working and getting fatigued. They eventually adapt to the over stimulation of the certain color or colors being looked at. Stare at the black dot for 20 seconds then look away and let the after image brighten up your day.

In the picture below there is another neat example of this:

As you stare at the black cross in the middle of the circle you will start to see the a blue circle appear and then eventually the pink dots disappear all together.

Optical illusions are also caused by the colors around the object, just as you will see in the picture below:

Optical illusions are very interesting to observe, but it's also neat to find out what causes them. Our brains are funny things. They don't like when something doesn't make sense, so they fill it in themselves.

Did you know we all have a blind spot? Yes it's true. In our eyes there is a spot in our retina, the back of our eye, where the two nerves form the optic nerve. The optic nerve forms our blind spot, because there are no rod or cones in that area. 

We never notice our blind spot because our brain fills it in for us. Still don't believe me? See for yourself.

Close your left eye and stare at the plus sign with your right eye. When the black dot disappears you have found your blind spot! You may need to get closer or further from the cross, but eventually the black dot will disappear. Info from http://serendip.brynmawr.edu/bb/blindspot1.html

As you can see there is plenty fun and educational things you can get from optical illusions.

Word of the Week:

perception: the act or faculty of apprehending by means of the sensesor of the mind; cognition; understanding.