Check this, I have included two of them!
I’m pretty sure it’s psychological line
Because the line is being drawn in their head making it a psychological line
this is more of a personal question, i guess one example would be to study on the subject youre teaching, but like I said, this is more of a decision you would make
If we stare at a pattern for a sufficient amount of time, our brains will cause the pattern to spontaneously reorganize itself.
Many psychologists believed that humans' pattern recognition abilities exist to aid us in our survival. This ability make us able to quickly identify possible danger/occurrences from several sign, which will help us to produce faster fight or flight response.