I love that you're learning perspective! It's such a game changer once you understand it. So you're probably familiar with the x, y, and z axis. These are the directions used to describe 3D space. The horizon line is actually a combination of the x and z axis. Technically there is a second horizon line that is perpendicular to the x and z one. This is the y axis. It functions exactly like the other horizon line with it's own vanishing points that appear when you rotate something in the y axis. We also are acknowledging the existence of the y axis any time we draw in 3-point and 5-point perspective. So super simply, just imagine you're drawing another horizon line going vertically and put down your new vanishing points like I did in the top right. Make sure you place them so they form a right angle or their lines are perpendicular where they cross. Like the distance between them isn't too far and isn't too close. Honestly, it's not necessary that you totally understand this. We're artists and as long as we get something that looks close enough it's fine. An easy way to get something looking convincing is to make your converging lines parallel. If you're ever too lazy to make a perspective grid, just make sure all your lines converging on the same vanishing points are parallel with each other. This video is really good at showing what I'm talking about youtube /watch?v=rkp1xfWJ9n4 Hopefully this was helpful! | Artwod Feedback