The article doesn’t explain why this is interesting. Here’s a different way of putting it: A classic pinhole camera is a box with a hole in it. The hole is sma

The article doesn’t explain why this is interesting. Here’s a different way of putting it: A classic pinhole camera is a box with a hole in it. The hole is small, so not much light gets in. We replace it with a lens that acts in effectively the same way, but lets in more light. The pinhole is inside the camera, and there is an obstacle in front of the subject, so the camera can’t see it. The fun thing here, is that this camera has a pinhole _outside_ the camera, so the pinhole can be positioned on the other side of the obstacle, and therefore take a picture of the subject.