Our collective memory contains thousands of faces, names, brands, objects, scandals, disasters and victories. Like I said above; you often only need a small clue to understand what is meant. Two musical notes heard … and you can sing along to the song. Just some initials could be enough for certain celebs or brands. A low resolute image of a security camera can direct you to the criminal. Or to the hero.
No detailed image is needed to recognise the Beatles.

Acrylic on 946 canvases

Or to recognise a Vermeer. Acrylic on 513 canvases.

Or Frida Kahlo. Acrylic on 1024 canvases.

Heisenberg (or Walter White) from Breaking Bad. Acrylic on 667 canvases.

No detailed image is needed to recognise the tv test card. Although you probably need to be born before 1980.