Vision is the most effective way for us to know the world, so there is a more special way to extract Visual memory, that is, we can use the skill of Mind's eye, which is commonly called imagination, so that we can see the Mental image of what we are imagining. For example, the image of chopsticks appears when you think of chopsticks, and classic movie pictures or photos appear when you think of Audrey Hepburn. I also sometimes think of some particularly horrible, cruel and bloody pictures, my body chills for a while, and then I just control myself not to imagine.