Chapter 24 invisible visitor

My dog ​​suddenly barks.I rushed over and found nothing.There were no figures or footsteps outside the courtyard gate, nor any wind and grass.The only things the dog saw were ordinary fences and old trees. What did the dog see?What makes it uneasy? It is likely that the owner feels that the animal has nothing to do.In fact, dogs do not necessarily see things that humans do not see.Even from person to person, vision is not consistent.We all know that drug addicts, sleepwalkers, people with fainting fever, and people with special senses can see many phantoms under certain circumstances. When my mother was seriously ill and had a high fever, she could see some strangers, and the phantoms would not occur until the fever subsided. disappear.Furthermore, when there are differences in vision between people, it cannot be said that what a normal person sees is correct.The oblique shadow in the water that normal people see is distortion, and the mirage seen by normal people is even more false. The movie screen without sash joints is also an illusion of the eyeball.Infrared light, molecular structure, and dark matter—much of what actually exists around us is beyond our vision without the necessary equipment.

Humans have always been half-blind, so they are not qualified to laugh at dogs.How can I assume that the dog just barked for no reason?Maybe something that I can't see comes and goes away; or descends, then soars; The yard was empty except for the dog sniffing around, snorting from time to time.