I always see diagrams of how a camera obscura works where the projected image neatly stops before or at the edges of the wall opposite the pinhole.
But when I look at pictures and videos of rooms converted into a camera obscura (usually as a fun experiment), the image often continues projecting onto the roof, side walls and floor. For example, there is a great picture here demonstrating this:
Even though we're primarily interested in the wall directly opposite the pinhole (since in a camera, that's usually where the film or sensor is) doesn't it also mean those diagrams are not entirely accurate then? Should they look less like this:
And more like this?:
Or even like this? For I have heard in various places that the angle of view can even be as much as 180°:
(Apologies for my crude diagrams but I think they get the point across)
(I originally posted this question in the Mathematics Stack Exchange, but decided it might be better here instead. I hope this is the right place for it)