Pattern and Scale
Compositionally, a photograph without a central item of particular interest can work when the photo is about a distinctive pattern. The scale of the pattern doesn’t really matter. Macro patterns (like the water drops on a spider web above) or trees on a snow-covered cliff in Yosemite’s winter (below) can be interesting.
Provided the pattern provides variety as well as homogeneity. And that the photograph has enough resolution so that the water drops or cliff side can really be scrutinized. With this kind of photograph, the viewer wants to believe it might be possible to delve into the pattern closer and closer without ever disrupting the suspension of disbelief.
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