Seeing Depth

Your Brain has many ways of telling how far away an object is.  Some of those ways are:

Stereoscopic Vision

We have several indicators that allow our brain to "see" depth.  One of them is stereoscopic vision - two eyes create one 3-d image.

Try this:

Frame Game

Once you have control of your eyes try looking at The Magic Eye books or other 3-d books.

Or take a look at a student page on Stereograms

 Image Size

If you have experience with an object your brain will make a comparison to the image size on your retina to it's remembered size.  This will give you a sense of how far away an object is.

Motion Parallax

Things closer to you will move more in your vision when you move your head or eyes.  Your brain senses this and gives you a sense of distance.

Color

Your brain senses even subtle changes in colors of objects and will adjust your depth percection accordingly.  An example of this would be that objects at far distances are "bluer."  You may not even consciously notice this but your brain does and gives a sense of depth.

Moon Illusion due to atmosphere

Linear Perspective

Lines going away from you seem to converge due to the "squashing" of your field of vision.  If your brain senses this going on in your field of view, a sense of depth is created.

Street Art

Julian Beever's Web Site 

Street Painting