This picture by InterfacePublications would be commonly understood as a realist representation of a street in Melbourne in the sense of resembles, is similar to, a copy of, this particular urbanscape, even if it could be interpreted as an abstract image.
In this sense realism is the standard mode of representation of photographers and it has become historically become understood as an equivalent for universal or "natural" visual experience. It---perspectival realism---- has been underpinned by traditional practices, customs and habits that reach back to Alberti's 1453 text De Pictura -----and is the key mode of representation of the mass global visual communication networks (film photography and television).
Should photographers question perspectival realisms that is assumed to be natural ---we have invented and built a a machine (the camera) to produce this conventional or historical sort of image and this has reinforced the conviction that this is the natural mode of representation as opposed to a historical way of looking or seeing.
Many of the images in altfotonet work within the abstract mode of representation and they often go beyond pure formal concerns to refer to, or express, feeling or mood. Few of the abstract photographers would accept that their image, no matter how abstract, is wholly decorative . To say that it is contentless abstraction, without a subject matter, would be interpreted as a slur on their work.