Why are images upside-down in a pinhole camera?

You can figure out why an image in a pinhole camera is upside down if you think about how the light travels to get to the image.

Light from an object higher (or the top of the object) than the camera travels in a straight line down to the camera. It goes through the pinhole and continues heading down until it hits the back of the camera. This means that the image of something higher than the camera is now low in the image. The opposite is true for light from an object lower than the camera (or the bottom of the object): it travels to a point higher in the image.

Still does answer my question, how did the image get upside down? answer was no concusive.