A classic puzzle, the answer to which is that the projection takes place along the z-axis rather than x-axis. Richard Feynman nicely explains this in this vide

A classic puzzle, the answer to which is that the projection takes place along the z-axis rather than x-axis. Richard Feynman nicely explains this in this video: https://youtu.be/6tuxLY94LXw https://youtu.be/6tuxLY94LXw