How to describe time.
Long, short, momentary, immortal. Abstract and mysterious.
I heard that because light takes a certain amount of time to propagate, although it is so small that even the most sophisticated instruments are difficult to detect it, it does make you sitting across from me somewhat unusual. It is a difference that can be easily divided into "present" and "past". All I see is you from the past.
In this way, the past and the future are no longer distant concepts that cannot be heard from each other. Because of the slight error in the speed of light, there is a simple connection, like a light touch on the shoulder. My present is always connected to your past. Then, my present must be tied to someone's future. Those movies about time, the drawers of Nobita's house, and the too difficult scientific explanations, at this unexpected moment, lost their mysterious and romantic color, and turned into a hazy vapor, which was incomprehensible, unclear, but very certain of existence.