Camera obscured questions

• what did you see while you were inside the camera obscura
  cars going past and we could see buildings.
  
• how is this camera similar to the inside of a camera?
  it makes out every thinking you can see and makes it up side down
  like a normal camera.
  
• hows it different ?
  it shows less light and does not turn the image the right way up
  
  
• why was the image upside-down?
• because the it is dark and you eyes can not work normally to
  light