How to play the pyramid of cards

To build a card pyramid, as we can see, we should use cards from bottom to top, combine two cards on the table into a triangle, and then copy each triangle one by one in parallel. It is best to keep a short distance between the two triangles, then build a card on it, prepare the second floor (foundation), and so on. In practice, any action will be correct.

If my understanding of the card pyramid is correct, I don't know why it should be classified as crossing the line of fire. Is there a game? )

PS: Because I don't have much practical experience, I don't know whether a smooth desktop is better than a rough one.