How a pinhole camera works:
How a real pinhole camera looks like:
Contrary to my belief, the images this camera showed were actually very clear! Some examples are in the next post: Hands-on: Pictures from a Pinhole camera
Another type of pinhole camera with different pinhole sizes:
The images from this pinhole camera are not as clear as the first one. They mostly appear as tiny dots on the screen, and I could only make out the image on the screen when using the biggest hole.