The accusative case makes the object a direct object where you are going to do something with that object.
In other words, the direct object is "receiving the action of a transitive verb". (1)
What can you do with that object? Almost anything. You can see it, you can touch it, you can cut it, you can eat it, you can throw it, ... It depends on that object itself.

Ali, once explained the transitive verbs with a tomato example which was an interesting reading. Maybe you can find his message.

Of course the object that takes the accusative case suffix wont be a subject of any clause or sentence.

(1) Quote from this page:
http://www.answers.com/main/ntquery?sm1=ZGlyZWN0IG9iamVjdCA=&fw=-1&fc=-1&ss=0&es=0&gwp=11&ver=1.0.8.207&method=1

There are still no images in your posts......
"Mesajlarında hala resim yok."