You can call "sampling" "interaction" instead, if it's clearer. It still happens. The "shutter speed effect" that your eyes produce are effectively what you pe

You can call "sampling" "interaction" instead, if it's clearer. It still happens. The "shutter speed effect" that your eyes produce are effectively what you perceive as your reality. If you could perceive as fast as a hummingbird or a bee, your reality would look a lot different. Making a photographic film interact with photons is effectively sampling. The film is sampling the photons in the sense that whatever vibrations/waves the film is made of is interacting in a certain way with the vibration/wave of the photon. This process is going on continuously, non-stop every single moment, for everything.