Time and photography are deeply connected, but the relationship is complex. Because it is physically produced by the subject itself (it reflects light), it has a status of objective evidence and instant reality.
However, a photograph does not reflect our perception of temporality, it is only one possible image from an infinity. A moment earlier - or a moment later - and another vision would have been captured. A portrait - or an event - takes place in a time interval and the photographer's vision is infinitesimal.
As noted by Robert Doisneau, after all, a hundred photographs represent just one second of time.
The portrait - or the photograph an event - gives an overview of the subject that will withstand time, but is insufficient by itself to express the complexity of the subject.
To choose as subjects what may be regarded as abstractions has the advantage of releasing these considerations. Of course, these forms - produced by mixed liquids - exist in time: they arise from a single dropto thrive, flourish and eventually disappear, but we can hardly attach importance to this course, pure physical evolution of inanimate matter.
So, we are free to see these images as mere snapshots: what was before, what will happen after... we are not interested. We can enjoy the sensation of observing a pure moment of eternity.