Today, my grandmother went to the funeral. I saw one of my left slippers in the crematorium, and the shoes were covered with dust. When I got home, I found that I really lost a slipper and my family.

From a scientific point of view, it must be an accident (even if you find the shoe, or finally confirm that the shoe is the one you lost! ) It doesn't make any sense! Just because a meaningless action encourages the illusion that you think this matter is meaningful! (similar to survivor bias)

Metaphysical, it's hard to say. After all, I have never studied metaphysics. Maybe it's the nostalgia of the old man, or his love for you, or just that your relatives want to remember you in another world, or something else.

From a psychological point of view, you have received some psychological hints. The basic logic of these hints is that you are influenced by religious ideas of words and deeds and make you feel meaningful. Just like some people who have been struck by lightning, people who are called "struck by lightning" in China should be punished by God, but in the scientific community, he has a very strict explanation. And many good people have suffered the same misfortune, so what will the conclusion be?