When a photograph touches the concept of time, it is nothing but an act of "holding.
At the very least, as our common understanding and preconceived notion of time, it has a certain persuasive power.
At the end of time, there is always "death," and all organic matter decays.
Knowing this, the emotional process of death evokes a kind of melancholy (nostalgia), and the subject takes on a certain "fear".
Fear is the most "inflexible" of human emotions, and is part of our instincts.
Fear controls us in the same way that we cannot control our heart or breathing. No one can "stop" it. It is an instinct that we have in order to avoid life threatening situations.

However, since it is an emotion, it can be alleviated or adjusted.
This is where the fluctuation of a "heart" (what we think) can exist.
When the concept of time is introduced into the role of the photograph as an image, it inevitably triggers fluctuations in the "mind.