Cameras record reality. We think they do. But "reality" is a little more complicated than that. Our vision, as incredible as it is, doesn't see most of what's around us. Solid objects, for example, are mostly empty space. Aside from that, what a flower looks like to a gardener differs from what it looks like to a deer or a cow, which differs from how it appears to a spider, which probably differs from what it looks like to a hummingbird or a butterfly. So abstract images can be a little challenging for some of us. We want to know what we're looking at. Maybe because of our expectation or assumption that cameras record reality, it's difficult for us to be satisfied when we can't recognize the reality that a photograph represents.
But abstracts can also be fun. If we can step away from the need to recognize every last detail and allow ourselves to be carried away by the lines, shapes and textures of an image, to enjoy the way the artist composed the image, designed it really, to convey a sense of mystery within simplicity, or perhaps simplicity out of complexity, that when it works is also beautiful, the images can be deeply satisfying. And if they do convey a sense of mystery, they can hold our interest over time, perhaps more than a classic pretty picture does.