Printer Paper make the best paper plane.
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a piece of paper
a sheet of paper
Point
It is the intersection of two planes at the spine of the paper -- two flat regions represented by the two pages of the newspaper. Each is a separate plane, and they cannot be coplanar since there is an angle between them. If you lay the paper out flat, they become a single plane.
A plane is a flat surface that extends infinitely. Think of it as a piece of paper that goes on in every direction (but not "up" out of the paper). A horizontal plan just means that it extends horizontally (like a piece of paper on a desk). Another example would be the floor you are standing on or the ceiling above it. However, your monitor is - more than likely - facing up and down. That is NOT a horizontal plane.