Points, lines and planes are all basic language in human vision. When a point move, it will generate ordered or unordered locus, that’s also called a line. How the relation of lines and points shown in computer language?  Besides, what kind of connections are there between computer screens and those points and lines. I projected my final work on a corner of walls; in this way, I try to present the fundamental point-line relationship in computer visual. On basis of this, I further explore the application of computer algorithms in designing at later stage.