system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: Why does the mouse disappear off the bottom and right of a monitor but not on the top or the left side?
gpt
Because the part of the Cursor that is relevant is the "point" of the "arrow". The rest of the image serves no technical purpose, it's just there to help you to associate it with the concept of pointing at something.   So because of the shape of the Cursor, and with the intent of being able to click on anything on the screen, the image would have to  

A. Vanish into the bottom and right edges of a screen  or  
B. Flip around to stay in view.  

Obviously we went with A, because B is just confusing and dumb.