Abstract is not representational of the object you are taking a picture of. You are taking the essence of color and form in an aesthetic arrangement. That abstraction is art. Most of the time abstract art does not have a function and is art in its form.
Most photography has a function, a picture of a car shows you that it is a car. The idea of an abstract photo is to take a shot of that car that is not representational of the car.
Like the first picture in the thread, is it a sink? is it outside plumbing?
Abstract art is just that.
Here are a few examples:
A cloud, that you take a picture of, cropped because that crop looks like a dog is an abstract. An underwater picture of a bunch of bubbles is abstract.
One thing to remember... abstract doesn't have to be anything and that is the idea.
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