Projective plane

A projective plane is like a piece of paper that has no end, it goes on and on forever. But the paper is a little different than regular paper that you can hold in your hand because it has some special things about it. For example, on this paper, you can draw a straight line that never ends in both directions, even though it may look curved or bent.

Another special thing about this paper is that any two lines you draw on it will always cross at a point. This is different from regular paper where two lines can be parallel and never meet.

Now, imagine you take this paper and fold it in half, but instead of creasing it down the middle, you fold the two sides together so that they overlap. When you do this, you create what's called a "projective plane" because it has all the special properties we just talked about.

So the projective plane is really just a special type of paper that goes on forever, but has some really cool properties. It lets us draw straight lines that never end, and any two lines we draw will always cross at a point.